What does U stand for?

Atomic Unit (measure of mass)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Tetra-Zolium Violet Transitional Zone Volume (anatomic measurement of prostate gland) Triple Zeta Valence Turisticka Zajednica Velike Gorice (Croatian: Velika Gorica City Tourist Board) Triple Zeta Valence Plus Polarization Technologiezentrum Wasser (German) Thunder Zone Wrestling (Michigan) Tappan Zee Express (commuter bus company) Trabzon, Turkey - Trabzon (Airport Code) Tianjin Zhong Xin Pharmaceutical Group (Singapore)		Envelope or Letter Sheet (Scott Catalogue prefix; philately) Kosher (from Union of Orthodox Hebrew Congregations) Sunday (one letter abbreviation for day of week) Ultra Umbrella Umdrehungen (German: RPM) Umpire Unclassified Uncle Uncleared

Samples in periodicals archive:

The Kaiga plant has four atomic units of 220 MW each with a combined installed capacity of 880 MW.

India : Karnataka seeks 2000 MW nuclear power plant

The IRGC's specialised but secret atomic units are said to be close to mastering the nuclear fuel cycle.

Russian Mediation

In ordinary crystals, no overlap occurs, and the atomic unit cells pack into a repeating pattern, which gives the structure minimum energy.

Clusters and decagons: new rules for constructing a quasicrystal

Japan's biggest supplier of reactors by capacity, and Russia's nuclear energy company OAO Atomenergoprom plan to design and build atomic units together and develop the production of reactor fuel.

JApan : Toshiba, Russia Agree to Design Nuclear Reactors