Balance of plant, the supporting components and auxiliary systems of a power plant
Basic oxygen process, a method of steelmaking
Best Operating Practice (used by Thames Water to describe operation of water and waste water treatment plants in the UK)
BIOS operation (bop), used as noun and verb, a technique to transition from 16-bit virtual x86 mode to 32-bit protected mode utilized by Microsoft's NTDOS
Bleeding on probing, expression used by dentists to signify gingival (gum) bleeding on mechanical stimulation by a probe
Blowout preventer, a large valve used in oil or natural gas drilling
Bond order potential, a form of interatomic potential used, for example, in molecular dynamics simulations
Border Pacific Railroad, a short-line railroad headquartered in Rio Grande City, Texas, United States
Bowes Park railway station, London, United Kingdom (National Rail station code BOP)
Bouar Airport, Central African Republic (IATA code BOP)
BOP, an acronym applied as an adjective to components or technologies that are common between three Divisions of General Motors: Buick, Oldsmobile, and Pontiac, e.g. Bellhousing Patterns, or Rear Axle Design