One of the mysteries of the English language finally explained.
nounUnited States Air Force
A gap at the centre of the reticle or cross-hairs on an optical gunsight. In later use also: the visible aiming point of a laser targeting system; the electronic representation of a weapons aiming point on the head-up display of a fighter aircraft.
1950s; earliest use found in Statesville (North Carolina) Record & Landmark. Probably from pip + -er.
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