(curling) The 4-foot diameter circle in the house / (rail transport) Alternative form of four foot

(law) Alternative spelling of four L

Alternative form of 420

Alternative spelling of four-on-the-floor.

Alternative spelling of four-dimensional.

(climbing) A technical climbing technique used in ice climbing to gain a respite and lessen slack and distance from the undersurface/ceiling which one is climbing underneath, which appears like a number "4" in shape, with one arm anchoring the climber to the surface while hanging upside-down, and one leg wrapped around that arm, forming a figurative "4" in shape.

Initialism of dipeptidyl peptidase 4., inhibitors of which are the gliptins

Alternative spelling of grade four

Alternative form of 420

Abbreviation of 4-fluoroamphetamine.