test pattern
(dated) A shoehorn. / (obsolete) Anything that facilitates a transaction; that which smooths the way or greases the wheels.
(mathematics) Any closed curve described by a Cartesian equation of the form (x²+y²)²=2a²(x²-y²).
A computer program that performs rasterization.
(US, television) A test signal, typically broadcast at times when the transmitter is active but no program is being broadcast.
深夜の保守作業中、放送局は数時間にわたりカラフルなテスト信号を放送した。
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