Whyforhowcome there's a rubber ducky instead of the indian?!?!?
Edit to add:
Trivia: Prior to the "turn on" of color TV, *EVERYTHING* but the indian on that card (Except for the "Please Stand By" that somebody has supered onto it) had a specific purpose. It was used to align the image on the tube in several ways, and even served to test whether the modulation of the signal was correct (the black bars would cause ringing/buzzing/whining in the audio section if the modulation was off, as well as their primary purpose of being places to take measurements (with a pair of calipers held against the screen) that would indicate if the image was set to the correct width)
Any problems with the image due to poor alignment of the TV set would show up as measurable distortions in the various circles and lines, and which one was distorted which way would tell a good TV tech what sections of the circuitry driving the picture tube was out of adjustment, and even give an idea of "which way" (too high or low of a setting) it was off, and by how much.
Once color TV became a real thing, the indian, which previously had been little more than an afterthought (though it was sometimes used as a quick-n-dirty "looks OK, hand it back to the customer"/"looks like something's hosed, tag it for further evaluation" indicator) the indian's headdress tested the color-burst signal.
Even the grey background was part of the testing. When certain parts of the drive circuitry were on the fritz, the grey would flicker, become black (or as black as a TV screen can display), or just plain vanish entirely.
Which was why it came to be called "The Test Pattern".
And now you know...
The Rest of the Story!