| 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 screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| ctn | |
| —abbreviation for | |
| cotangent | |
| ctn cotangent |
| CTN can't talk now |
| ctn. carton |