a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
1838, from post (1) in the verbal sense of "fasten to a post" (1633). Poster boy/girl/child "someone given prominence in certain causes" is from 1980s, in ref. to fund-raising drives for charities associated with disability, featuring child sufferers, a feature since 1930s.