optical soundtrack

noun

the final soundtrack on a motion picture, which appears as a band of black and white serrations along a strip of film to the left of the composite print. Light is shined through the serrations and is converted to audible sound.

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Also called optical track.

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Optical soundtrack is always a great word to know.

So is interrobang. Does it mean:

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.

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