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4:15 ·
The angle sign, like the arrow sign, basically means directed movement and is thus associated with energy. The spectrum of meaning of this entry sign is centered around the concepts of work, energy, and effect. We see this spectrum of meaning in  , the sun rune in the earliest runic alphabet (and a letter for s-sound in the Old Latin alphabet) and as  in technical contexts and electricity notation.
In the ground-to-air emergency code,  means mechanic is needed, i.e. something is wrong with the source of energy, the engine. In the British system of hobo signs, drawn on a wall denotes here they demand that you work hard.
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