29 CFR 1926.203

Definitions applicable to this subpart.

Defines terms used in Subpart G: barricade, signs, signals, tags, flagger. A barricade is an obstruction to deter the passage of persons or vehicles; signs are the warnings of hazard, temporarily or permanently affixed or placed; signals are moving signs, provided by workers (e.g., flaggers) or by devices for warning and direction. (Reference https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.203.)