signboard

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signboard

a board carrying a sign or notice, esp one used to advertise a product, event, etc.

sign, signboard

1. A display board or surface used for directions, identification, instructions, or advertising; usually consists of lettering, pictures, diagrams, decoration, etc., often in combination, on a contrasting background surface.
2. According to OSHA: a warning of hazard, temporarily or permanently affixed or placed, at a location where a hazard exists.