plan position indicator

plan position indicator

noun
a radarscope on which an object reflecting radar waves shows its bearing and distance from the radar detector by causing a spot of light to appear on a screen that represents a map of the area around the detector. Abbreviation: PPI

Origin:
1940–45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Plan position indicator is always a great word to know.
So is callithumpian. Does it mean:
the offspring of a zebra and a donkey.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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