Resistance-value - A measure of thermal resistance used in domestic insulation.

(business) Initialism of Research and Development (a department within a company (or governmental division) dedicated to that task, or the fiscal category that represents it in fiscal reporting.)

(slang, humorous) Ritalin, an amphetamine-like psychopharmaceutical, prescribed for ADHD.

Initialism of resisting and obstructing

Initialism of regular and frequent.

Alternative spelling of R & B

Abbreviation of rhythm and blues. / Ellipsis of contemporary R&B.

(organic chemistry) A crystalline sulfonic acid, HOC₁₀H₅(SO₃H)₂, derived from beta naphthol and used as a dye intermediate; 2-naphthol-3,6-disulfonic acid.

(physics, astronomy) The relatively rapid nucleosynthesis process, in supernovae, in which a large neutron flux allows rapid neutron capture and synthesis of elements up to the transuranic elements.

a Soviet rocket modelled on the V-2; the Scunner