Area unit and B

Area unit noun - A system of units used to measure areas.

B and area unit are semantically related. In some cases you can replace term "B" with "Area unit", this terms are similar.

B noun - (physics) a unit of nuclear cross section; the effective circular area that one particle presents to another as a target for an encounter.

Area unit and b are semantically related. You can use "Area unit" instead a noun "B".