an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
1555, whobub "confused noise," generally believed to be of Irish origin, perhaps from Gaelic ub!, expression of aversion or contempt, or O.Ir. battle cry abu, from buide "victory."