Glossary U - Yenra

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Historical names & systemsUCD (check images)

Universal companion document, guidance for implementing a specified check-image exchange standard. The document's version and the underlying X9 standard are necessary parts of the reference.

Related coverage: Check images

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Web & documentsUDDI

Universal Description, Discovery and Integration: a specification for registries describing businesses and web services. It belongs to the service-discovery architecture used by the particular system.

Related coverage: UDDI

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NetworksUDP

User Datagram Protocol: a transport protocol carrying individual datagrams with limited built-in services. Applications or higher-level protocols decide how to handle loss, ordering and congestion when those features are needed.

Read the guide: OSI Layers in Practice: Follow a Connection, Find a Fault

Reference: UDP specification (RFC 768)

Compare: TCP, QUIC, TLS

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Computers & specificationsUFS

Universal Flash Storage: a JEDEC standard family for communication between a host and flash-storage device. It defines an interface and related commands used in devices such as phones. NAND describes the underlying memory technology; UFS describes how storage communicates. Compare the actual device and host capabilities when interpreting a version or performance claim.

Guide: 64-Layer 3D NAND Explained: Flash Memory and UFS

Reference: Linux kernel documentation: Universal Flash Storage architecture

Compare: NAND flash, NVMe, SSD

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NetworksUMTS

Universal Mobile Telecommunications System, a third-generation mobile communications system. Supported bands, network operation and service configuration determine whether a particular device can use it.

Related coverage: UMTS : Universal Mobile Telecommunications System

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Audio & videoUpscaling

Resampling an image or video to a larger pixel grid for display or output. Processing can improve its presentation, but the source's recorded detail remains a constraint on the result.

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

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Web & documentsURL

Uniform Resource Locator: an address that identifies a resource and how to access it. A web URL can include a scheme, host, path, query string and fragment; each part has a different role.

Read the guide: How to Read a URL: Domains, Paths, Queries, and Fragments

Reference: WHATWG URL standard

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Computers & specificationsUSB-C

A reversible USB connector type, also called USB Type-C. The connector shape alone does not establish supported data speed, display output or charging power; check the capabilities of the port, cable and device together.

Read the guide: Technology Terms That Help You Read Product Specifications

Reference: USB-IF: USB Type-C

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Computers & specificationsUSB Power Delivery

A USB specification for negotiating power between compatible connected devices. The supported source, receiving device and cable together determine the usable charging arrangement. Check the laptop’s input requirements and the supply’s available power modes; a USB-C connector identifies the plug shape while Power Delivery describes power capabilities.

Guide: Laptop Batteries and Power Banks: Compatibility, Health, and Runtime

Reference: USB-IF: USB Power Delivery

Compare: USB-C, Watt, Pass-through charging

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Science & measurementUTC

Coordinated Universal Time, the international time reference based on atomic time with adjustments relating it to Earth's rotation. UTC itself does not shift for daylight saving time; local civil time applies its own offset.

Reference: NIST: UTC and other time scales

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