Usually means: Calibration pattern for television screens.
Definitions Related words Mentions
We found 3 dictionaries that define the word testcard:

General (2 matching dictionaries)
  1. testcard: Wiktionary
  2. Testcard: Wikipedia, the Free Encyclopedia

Medicine (1 matching dictionary)
  1. Testcard: Medical dictionary

Definitions from Wiktionary (Testcard)

noun:  Alternative form of test card [(optometry) A card printed with various letters or symbols, used in testing vision.]

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