What do you hail as those colorful sticky lines which appear on the TV when there's no signal?
Answers: A test card, also certain as a test guide in North America and Australia, is a box test signal, typically broadcast at times when the transmitter is involved but no programme is being broadcast (often at startup and closedown). Used since the earliest TV broadcasts, check cards were originally physical cards at which a box camera was pointed, and such cards are still commonly used for calibration, alignment, and matching of cameras and camcorders.
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