a smooth, white surface for writing on with dry-erase markers

a mahjong tile with either a blank face or a square frame design

a clean slate or tabula rasa; a person who lacks knowledge or experience in a certain field

(Taiwan colloquial) a sedative or hypnotic drug, often misused as a narcotic; also known by the brand name Mandrax

(bound form) an unpainted or unfinished wooden board