Recall is a bugle

Bugle (instrument)

The bugle is one of the simplest brass instruments, having no valves or other pitch-altering devices. All pitch control is done by varying the player's embouchure, since the bugle has no other mechanism for controlling pitch. Consequently, the bugle is limited to notes within the harmonic series...

 call

Bugle call

A bugle call is a short tune, originating as a military signal announcing scheduled and certain non-scheduled events on a military installation, battlefield, or ship. Historically, bugles, drums, and other loud musical instruments were used for clear communication in the noise and confusion of a...

 used to signals to soldiers that duties or drills are to cease, or to indicate that a period of relaxation should end. Outside of a military context, it is used to signal when a game should end, such as a game of capture the flag

Capture the flag

Capture the Flag is a traditional outdoor sport generally played by children, where two teams each have a flag and the objective is to capture the other team's flag, located at the team's "base," and bring it safely back to their own base...

 among scouts

Scouting

Scouting, also known as the Scout Movement, is a worldwide youth movement with the stated aim of supporting young people in their physical, mental and spiritual development, that they may play constructive roles in society....

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History

Like other bugle calls, "recall" is a short tune that originated as a military signal announcing scheduled and certain non-scheduled events on a military installation, battlefield, or ship. Historically bugle calls indicated the change in daily routines of camp. A defining feature of a bugle call is that it consists only of notes from a single overtone series. This is in fact a requirement if it is to be playable on a bugle or equivalently on a trumpet without moving the valves.