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| 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. |
| truth table | |
| —n | |
| 1. | a table, used in logic, indicating the truth-value of a compound statement for every truth-value of its component propositions |
| 2. | a similar table, used in transistor technology, to indicate the value of the output signal of a logic circuit for every value of input signal |