test card

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English[edit]

Test card (optometry)
Test card (television)

Noun[edit]

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Wikipedia

test card (plural test cards)

  1. (optometry) A card printed with various letters or symbols, used in testing vision.
  2. (UK, television) A test signal, typically broadcast at times when the transmitter is active but no programme is being broadcast (often at startup and closedown).

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