acoustical surveillance

acoustical surveillance

noun
the collecting or recording of information by sound-detection methods and devices, as for intelligence purposes.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Acoustical surveillance is always a great word to know.
So is interrobang. Does it mean:
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.
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