What does PR stand for?

Pneumatic Ram

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

Science, medicine, engineering, etc.

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Samples in periodicals archive:

The outside of the sphere is covered with pneumatic rams, which use compressed gas to accelerate pistons to around 50 m/s.

Canada : Canadian startup proposes nuclear fusion power plant at a ...

It is then elevated by scissor-lift to in front of the cutter section, where a heavy duty pneumatic ram pushes the cheese through the 'grill' of cutting blades, and a guillotine at the reverse side cuts the cheese to the required length.

Cheese is fast food for French market

To make the largest sculptures, some of which - such as one pyramid - are 45ft high, sand is poured into moulds and compacted with pneumatic rams called whackers.

Sphinx of Brighton; Built from 10,000 tons of sand, the glories of ...