Meaning
A hand gesture used in the dancehall to show approval and hype for a tune — most famously 'signal di plane', where the crowd raises and waves their arms overhead like guiding in an aeroplane. Giving a 'signal' is a salute of respect and excitement for the music.
Examples
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Wen di tune buss, everybody signal di plane.
When the tune dropped, everyone raised their arms to salute it.
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Gi di selecta a signal fi dat one.
Give the selector a hand-salute for that one.
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Di whole dance a signal.
The whole party is throwing up the hand salute.
Origin
From 'signal' (a gesture/sign); in dancehall the raised-arm 'signal di plane' salute became a standard sign of crowd approval.
How it’s used
A dancehall crowd gesture of approval; 'signal di plane' is the classic arms-overhead salute.