English: RCA black/white Indian Head test card, motif of the 2F21monoscope tube, used from 1940 until the advent of color television.
Español: Carta de ajuste de Cabeza de Indio, monocromática desarrollada por RCA en 1939, motivo del tubo monoscopio, modelo 2F21 usado en Estados Unidos desde 1940 hasta la llegada de la televisión a color.
Русский: Старая телевизионная тестовая сетка, разработанная инженерами компании RCA в 1939 году (широко использовалась вплоть до широкого распространения цветного телевидения).
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