Glossary C - Yenra

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Adjusting a device toward a specified operating state, such as a display's white point and luminance. Profiling then describes how the device behaves in that state; stable viewing conditions support meaningful comparisons.

Read the guide: Color Management for Digital Art and Printing

Reference: International Color Consortium: profiles

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AccessibilityCaptions (media accessibility)

Text synchronized with audio or video that conveys speech and relevant sound information, including speaker identification when needed. Closed captions can be switched on or off; open captions remain visible. Review timing and accuracy, including meaningful sounds, since dialogue-only translations may omit information needed to understand the media.

Guide: Website Accessibility Check: A Practical First Audit

Reference: W3C: captions and subtitles

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NetworksCaptive portal

A network access page that asks a visitor to complete a step, such as signing in or accepting service terms, before gaining broader network or internet access. Joining the Wi-Fi network and completing its portal are separate stages. Confirm the provider’s official instructions before entering account or payment information.

Guide: Airport Wi-Fi: Find the Official Network and Get Connected

Reference: Apple: joining captive Wi-Fi networks

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NetworksCarrier class

A description applied to equipment intended for telecommunications-provider operation. Establish the actual requirements for availability, redundancy, maintenance and support instead of treating the phrase as a universal certification.

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Computers & specificationsCAS latency

Column address strobe latency: the number of memory clock cycles between a DRAM read command and the first requested data becoming available. Usually labeled CL, it is one part of memory-access delay. Compare both CL and operating transfer rate: DDR5-6000 CL30 has a 10-nanosecond CAS component, not a guaranteed 10-nanosecond total system memory latency.

Guide: RAM Upgrades: Capacity, Compatibility, and Stable Settings

Reference: Corsair: CAS latency and memory timings

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Home & materialsCast aluminum

Aluminum or an aluminum alloy shaped by introducing molten metal into a mold and allowing it to solidify. The process can produce detailed furniture components. A finished item may combine cast and extruded parts; evaluate its alloy, joints, protective finish and care instructions alongside the casting description.

Guide: Cast Aluminum Patio Furniture: Construction, Finish, and Upkeep

Reference: The Aluminum Association: casting and extrusion

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Audio & videoCasting (media)

Sending or directing media playback from one device to a compatible receiver. Depending on the system, the receiver may fetch the stream itself or receive it from the controlling device; supported services and networks matter.

Read the guide: Internet Radios: Choose a Receiver, Find Stations, and Set It Up

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Energy & environmentCCS

Carbon capture and storage: capturing carbon dioxide, transporting it and storing it in a suitable geological formation. Evaluating a project requires following the whole chain and identifying the emissions that remain.

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Audio & videoCEC

Consumer Electronics Control: HDMI signaling that lets compatible devices exchange control commands, such as power, input selection or volume. Manufacturers use different feature names and support different actions. A TV remote controlling a soundbar through CEC demonstrates a control function; the return-audio connection is a separate ARC/eARC function.

Guide: HDMI Connections: Match Ports, Cables, and Features

Reference: Sony: HDMI-CEC control functions

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Computers & specificationsCE (consumer electronics)

Consumer electronics: electronic devices intended primarily for individual or household use. In product and trade-show reporting this abbreviation names a sector; the CE conformity marking is a different use of the letters.

Related coverage: CES 2010 exhibitors

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NetworksCell phone

A mobile telephone that communicates through a cellular radio network. Frequency bands and supported network generations vary by handset and carrier, so a single frequency range cannot describe every cell phone.

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NetworksChannel width

The frequency span used by a radio channel, commonly stated in megahertz for Wi-Fi. A wider channel can support a higher data rate when compatible devices and conditions allow, while occupying more spectrum and reducing opportunities to reuse separate channels nearby. Evaluate width together with interference, client support and measured throughput under the expected workload.

Guide: Wi-Fi Channel Planning: Balance Width, Reuse and Airtime

Reference: Cisco Meraki: channel bonding and width tradeoffs

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Computers & specificationsChecksum

A value calculated from data to help detect changes. Comparing a file’s checksum with a trusted earlier value can help verify a copy. The comparison must use the same algorithm; matching values do not establish that the original file was safe, complete or the intended recording.

Guide: Panasonic P2: Copy, Verify and Preserve Camera Cards

Reference: NIST: checksum

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Rocks & EarthChoropleth map

A map that shades geographic areas according to a statistic for each area, such as a district's percentage of tree cover. The legend connects colors to values or classes. Check the statistic's denominator, geographic boundaries and classification method: a uniform shade summarizes an area while local conditions within it can vary.

Guide: Map Colors with ColorBrewer: Choose, Classify, and Check

Reference: Esri: graduated colors and choropleth mapping

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Science & measurementChromatography

A separation method in which a mobile phase carries a mixture through or over a stationary phase. Components interact differently with the phases and therefore move differently through the system. Chromatography can separate substances before detection by mass spectrometry or another detector; assessing an identity also requires appropriate reference evidence and method checks.

Guide: Mass Spectrometry: Read the Signal and Understand the Evidence

Reference: Teledyne LABS: mobile and stationary phases

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Tools & workshopChuck

The holding mechanism that secures a drill bit or other compatible accessory. A common drill chuck closes three jaws around the accessory's shank, using a key or a keyless tightening mechanism. Check the chuck's size range and interface; the tool's permitted drilling capacity and operating mode are separate compatibility requirements.

Guide: Cordless Drills: Choose the Tool and Set It Up for the Job

Reference: Bosch: drill shanks and chuck interfaces

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Food & cookingChurning

In ice-cream making, agitating the mixture while it partly freezes, incorporating air and scraping frozen material from the cooling surface. This produces a softer mixture than the finished scoopable dessert. Subsequent hardening in a freezer freezes more of the remaining water; it is a separate stage, not simply more churning.

Guide: Homemade Ice Cream: Base, Churning and Texture

Reference: University of Guelph: freezing and whipping ice cream (PDF)

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NetworksCircuit switching

Communication that establishes a dedicated connection or reserved circuit resources for a session. Traditional telephone networks used this approach; the particular system determines how resources are allocated.

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Tools & workshopClamp force

The compressive force that holds the parts of a joint together. In a tightened bolted joint, tension in the bolt produces compression in the joined materials. Applied torque is an indirect way to establish this force: friction and assembly conditions affect the result. Follow the exact joint's specified tightening method and conditions.

Guide: Torque Wrenches: Specifications, Units and Controlled Tightening

Reference: Atlas Copco: clamping force and bolt preload · Nord-Lock: torque, friction and preload

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Rocks & EarthClass interval (mapping)

A range of numerical values assigned to one category in a map legend. Class breaks mark the boundaries between ranges. Equal intervals use equal numeric widths; quantiles aim for similar numbers of observations per class. Specify which boundary values belong in each class, and retain consistent breaks when colors must remain comparable across maps.

Guide: Map Colors with ColorBrewer: Choose, Classify, and Check

Reference: Esri: map data classification methods and class breaks

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Tools & workshopClearance hole

An unthreaded hole sized to let the specified fastener pass through a part without its threads engaging that part. In a screwed wood joint, clearance through the outer piece helps the screw draw the pieces together. Use the required fit and dimensions for the actual fastener and joint, separately from any pilot hole.

Guide: Drill Bits: Match the Material, Hole and Drill

Reference: Bosch: screw-shank clearance and joint assembly (PDF)

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Health & careClinical decision support

Tools that present relevant knowledge and patient-specific information to support care decisions. Examples include alerts, reminders and reference information; clinical judgment and the quality of the underlying information remain important.

Reference: HealthIT: clinical decision support

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PhotographyClipping (imaging)

The limiting of image values at the bright or dark end of a recording or processing range, which can erase distinctions in that region. Clipping may affect individual color channels as well as overall brightness. Check the image, histogram and warnings together, and distinguish a clipped preview from information still retained in the source file.

Guide: Landscape Photography: Plan the Frame, Light, and Exposure

Reference: Nikon: highlight warnings and image tones

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PhotographyCMOS image sensor

An image sensor built using complementary metal-oxide-semiconductor technology and associated readout circuitry. Sensor dimensions, pixel design and readout behavior help explain image quality beyond the CMOS label alone.

Read the guide: CMOS Image Sensors: Size, Pixels, Noise and Shutter Readout

Reference: Canon: image sensors

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Audio & videoCodec

A method or implementation for encoding and decoding an audio or video stream. Codecs determine how the media is represented and may use lossy or lossless compression. A container holds those streams; an MP4 filename alone does not identify every codec a player must support.

Guide: Lossless Video Codecs: Masters, Editing and Viewing Copies

Reference: MDN: media containers and codecs

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Science & measurementCoefficient of variation

Standard deviation divided by the mean, often multiplied by 100 to report a percentage. For example, a fictional mean volume of 100 µL with a standard deviation of 1 µL has a CV of 1%. It compares relative spread for measurements with a meaningful zero; values become unstable near a zero mean and are undefined at zero.

Guide: Pipetting: Improve Accuracy, Precision, and Repeatability

Reference: NIST: coefficient of variation and its limits

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Tools & workshopCollet

A sleeve-shaped clamping component that tightens around a tool shank. In a router, the collet holds a bit of the specified shank diameter, unlike the adjustable jaws of a typical drill chuck. Match the router's approved collet and bit: a 1/4-inch shank is 6.35 mm, so it is not interchangeable with a 6 mm shank.

Guide: Router Bits: Match the Profile, Shank and Cut

Reference: Freud: routing-tool clamping requirements (PDF)

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Art & colorColor space

A defined system for representing colors with numerical values and a specified interpretation. Names such as sRGB identify particular spaces; the same numeric RGB values can describe different colors in different spaces.

Read the guide: Color Management for Digital Art and Printing

Reference: International Color Consortium: profiles

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Audio & videoComponent video

Video carried as separate signal components. Consumer analog YPbPr commonly uses three video cables; audio is separate. Check the signal labels because similar-looking connectors can carry different types of information.

Read the guide: How to Play DVDs Today: TVs, Computers, Consoles, and Portable Players

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Audio & videoComposite video

An analog video signal combining picture information into a single signal path, commonly using a yellow RCA connector on consumer equipment. Audio uses separate connections; the connector shape alone does not identify every signal it can carry.

Read the guide: How to Play DVDs Today: TVs, Computers, Consoles, and Portable Players

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Art & colorComposition (art)

The arrangement of forms, colors, spaces and other visual elements in an artwork. Looking at balance, direction and relationships between figures helps explain how the arrangement guides attention.

Read the guide: How to Look at Seurat’s La Grande Jatte

Reference: Art Institute of Chicago: La Grande Jatte

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Science & measurementComputational reproducibility

Obtaining consistent computational results using the same input data, methods, code and analysis conditions. Preserving versions, dependencies and processing steps helps others rerun the analysis. This checks the computational result; evaluating the underlying assumptions and collecting independent new observations address additional questions about the scientific conclusion.

Guide: E-Science: Build a Reproducible Research Workflow

Reference: National Academies: reproducibility and replicability

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Security & privacyComputer virus

Malware that reproduces by inserting or attaching its code to another program or host object. Running or opening the affected host can help it spread; other malware may spread through different mechanisms.

Read the guide: Anti Virus and Malware: Protection, Recovery, and Outbreak Lessons

Reference: NIST: virus terminology

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Security & privacyComputer worm

A self-contained program that can replicate and spread between systems, commonly across a network. A worm can propagate independently of a host program; individual worms use different entry and spread mechanisms. Sasser, for example, spread through vulnerable network services. Identify the actual route when deciding which patches and containment measures apply.

Guide: Sasser: How a Worm Spread Without an Email Attachment

Reference: NIST: worm

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Science & measurementConfounding

A situation in which the available observations cannot separate the effects of two or more influences. In an experiment, testing every A specimen on Monday and every B specimen on Tuesday entangles treatment with day. More readings in that same arrangement preserve the ambiguity; the design needs comparisons that allow the effects of interest to be distinguished.

Guide: Research Design Tools: Turn a Question into a Testable Experiment · Causal Inference

Reference: NIST: confounding of experimental effects

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Audio & videoContainer (media file)

A file structure that holds media streams and associated information, such as timing, subtitles and metadata. MP4, Matroska and QuickTime are examples. The container is the wrapper; the codecs describe how its audio and video are encoded. Playback support depends on the actual combination, not just the file extension.

Guide: Lossless Video Codecs: Masters, Editing and Viewing Copies

Reference: MDN: media container formats

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AccessibilityContrast ratio (accessibility)

A comparison of the relative luminance of two colors, commonly text and its background, expressed as a ratio such as 4.5:1. WCAG 2.2 uses 4.5:1 for ordinary text under its Contrast (Minimum) criterion, with specified exceptions. Check the colors actually displayed together; passing this measure covers one aspect of readability.

Guide: Website Accessibility Check: A Practical First Audit

Reference: W3C: Contrast (Minimum)

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NetworksControl plane

The network functions that establish and maintain information used to direct traffic, such as routing decisions. Packet forwarding applies that information in the data plane.

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NetworksConvergence (services)

Combining services such as voice, video and data on a shared communications infrastructure. Capacity, service quality and operational responsibilities still need to be defined for each service.

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Rocks & EarthCoordinate reference system

A framework that connects coordinate values to positions through a coordinate system and a reference datum or frame. It specifies information such as axis order, direction and units. Geographic coordinates and projected map coordinates use different frameworks; identify the source and destination systems before combining or transforming location data.

Guide: Geocoding: Turn Addresses into Coordinates You Can Check

Reference: OGC: referencing by coordinates

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Food & cookingCreaming (baking)

Beating softened fat, commonly butter, with sugar to incorporate small air pockets before other ingredients are added. Those pockets help establish the texture of many cakes and cookies and can expand during baking. Melted butter does not hold this aerated structure in the same way; use the consistency and mixing cues specified by the recipe.

Guide: Cookies: Control Spread, Texture and Baking

Reference: King Arthur Baking: creaming butter and sugar

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Business & organizationsCRM

Customer relationship management: the practices and software used to organize interactions with customers and prospective customers. A CRM record may connect contact details, service history and sales activity.

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Audio & videoCrossover (audio)

Filtering that directs different frequency ranges to different drivers or speakers. A loudspeaker can contain a crossover network; an AV receiver can also use a crossover setting to divide bass between main speakers and a subwoofer. The frequency, filter behavior and routing must suit the particular system.

Guide: AV Receiver Setup: Inputs, Speakers, and Listening Modes

Reference: Yamaha: receiver crossover frequency and routing

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Food & cookingCrumb coat

A thin first layer of frosting that holds loose cake crumbs in place and provides a base for the final coating. Apply it to a cooled cake and let it set as appropriate for the frosting before finishing. Some cake or crumbs may remain visible through this preparation layer; its purpose is to support the later finish.

Guide: Cake Decorating: Level, Fill, Crumb-Coat and Finish

Reference: Wilton: crumb-coat purpose and preparation

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Security & privacyCryptographic erase

A sanitization technique that makes encrypted data inaccessible by sanitizing the cryptographic keys needed to decrypt it. Its effectiveness depends on the encryption implementation, coverage of the target data and elimination of recoverable key copies. A device-specific, verified procedure is essential; changing a login password alone does not establish that the data has been sanitized.

Guide: Computer Disposal: Reuse, Data Sanitization, and Recycling

Reference: NIST: cryptographic erase and key sanitization (PDF)

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Rocks & EarthCrystal

A solid whose atoms are arranged in a repeating ordered structure. Its visible faces can reflect that internal order, but a mineral grain can still be crystalline even when distinct external faces are absent.

Read the guide: Rocks and Minerals: A Guide to Observing and Understanding Them

Reference: National Park Service: minerals

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NetworksCWDM

Coarse wavelength-division multiplexing: carrying several optical channels at different, relatively widely spaced wavelengths on a fiber. Channel plans and the supported equipment determine which signals can share the link.

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A starting point for understanding

Each entry gives a concise meaning and, where useful, a distinction or practical example. Topic labels identify the context; the same acronym can have several meanings. Historical names remain useful when reading older coverage.

Follow the linked Yenra guides for fuller explanations and the reference links for supporting documentation. Health, technical and regulatory terms describe concepts; individual decisions depend on the applicable evidence, equipment and circumstances.

Collection updated October 13, 2026. Full glossary · AI Glossary