the use of a comma, rather than a semicolon, colon, or period, to separate related main clauses in the absence of a coordinating conjunction: often considered to be incorrect or undesirable, especially in formal writing.
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 stew of meat, vegetables, potatoes, etc.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.