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U
Symbol commonly used to denote an electrical voltage.
UAC
UAC, abbreviation for User Account Control, is a security ...
Ubiquitin
Ubiquitin is a small protein used to "label" other ...
UEPS
UEPS, Universal Electronic Payment System A banking ...
UHF
UHF, Ultra High Frequency, is the frequency band between 300 ...
Ulna
The ulna (formerly called the cubitus bone) is part of the ...
Ultrabasic
Ultrabasic describes an igneous rock with less than 45% ...
Ultrafiltration
Ultrafiltration is a technique for separating elements ...
Ultrasound
An ultrasound is a non-invasive investigation involving the ...
Ultraviolet
Ultraviolet radiation is electromagnetic radiation with ...
Ulysses
The ULYSSES probe is a joint ESA and NASA mission, devoted ...
Umbilical cord
In mammals, the umbilical cord is the organ connecting the ...
Umbriel
A satellite of Uranus. Umbriel (Uranus II) was discovered by ...
UML
Unified Modelling Language, UML, is an object-oriented ...
UMTS
Universal Mobile Telecommunications System: the name of the ...
Unbounded universe
Hawking designed a quantum model of an unbounded universe, ...
Unbundling
Unbundling a local loop means allowing new operators to use ...
Unconformity
Unconformity is the superimposing of strata with different ...
Undermining
Undermining is the hollowing action of flowing water (sea ...
Undulated green slate
Undulated green slate is a metamorphic stone of sedimentary ...
UNEP
UNEP is the acronym for the United Nations Environment ...
Unfractionated heparin
Unfractionated heparins (which professionals also refer to ...
Uniaxial
Uniaxial is a term describing a crystal that has an index ...
Unicode
Unicode is an encoding system created in 1998. It specifies ...
Uniport
A uniport is a type of transponder protein which only allows ...
Unit cell
A unit cell is the smallest volume conserving the ...
Universal time
In summer in London to obtain the legal time, 1h must be ...
Unix
UNIX is a multi-user, multi-task, operating system developed ...
Unknown
An unknown is an indeterminate element whose value or values ...
Unsanitary water
Unsanitary water is non potable water. Consumption of ...
Unsaturated polyester
Unsaturated polyesters are thermosetting resins widely used ...
Ununoctium
Ununoctium is the provisional name for the transuranic ...
Ununseptium
Ununseptium is the temporary name for the transuranic ...
Unweighted digital code
In an unweighted code, no weighting is assigned to the ...
Unzen
Mount Unzen is a Japanese volcano on the island of Kyūshū, ...
Up quark
The up quark is a particle of matter. It is one of the six ...
Upload
To upload is to transfer data or programs from a local ...
Upwelling
Upwelling refers to the rise of deep cold water, rich in ...
Uracil
Uracil is a nitrogen base (pyrimidine type with a hexagonal ...
Uranium
Uranium, a metal, is a natural element, silvery white in ...
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