What does RU stand for?

Replaceable Unit

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

Information technology (IT) and computers

Other Resources:

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Receive Unit Recorder Unit Records Unlimited Recycled Uranium Refrigeration Unit Regulatory Unit Reino Unido (Spanish: United Kingdom) Release Unit Remote Unit Renouvellement Urbain (French: Urban Renewal)		Reproducing Unit Request/Response Unit Rescue Unit Residential Unit Residual Urine (volume) Resistor Unit Restaurant Universitaire Reykjavik University (Iceland) Rhodes University (Grahamstown, South Africa) Rhutenium

Samples in periodicals archive:

The same principles hold true for the turn-in of line replaceable units (LRUs) and shop replaceable units (SRUs) for your M1-series tanks and M2/M3-series Bradleys.

Don't forget returns

CPU TECH), a leading provider of high performance computing solutions for military and commercial systems, announced today that its prototype AN/APG-68 Modernized Programmable Signal Processor (MPSP), a form-, fit- and function-compatible Line Replaceable Unit (LRU) for F-16 Block 30/40 aircraft, has completed Design Try Out (DTO) flight tests.

CPU TECH Completes Design Tryout Flight Tests for the F-16 AN/APG-68 ...

Without cards and power supplies, the BSTF will not be able to test and isolate faults in weapon system line replaceable units (LRUs) and shop replaceable units (SRUs).

Turn in parts for repair