Perspective Based Review, a software inspection style in the descipline of software engineering

Pebble bed reactor, a type of nuclear reactor.

Phi Buda ruda, a social college drumline fraternity

Point blank range

PBR is a three letter acronym that refers to

Plastic baton round, a type of non-lethal projectile more commonly known as the plastic bullet

Policy based routing

Peripheral benzodiazepine receptor, located at OMM (outer mitochondrial membrane), interacts with StAR (steroidogenic acute regulatory protein) to transport cholesterol into mitochondria

Pabst Blue Ribbon, a brand of beer

Patrol boat river, a type of river patrol boat used by the US Navy during the Vietnam War

Partition Boot Record, same as Volume Boot Record

Petrobras (NYSE: PBR), a Brazilian oil company.

Plant breeders' rights, a patented cultivar

Pokémon Battle Revolution, a video game for the Nintendo Wii.

Pre-Budget Report, one of the two economic forecasts that HM Treasury is required to deliver to the UK Parliament each year

Professional Bull Riders, a sport, circuit, and company for professional bull riding

Puffing Billy Railway, a narrow gauge tourist railway in Melbourne, Australia.