Mystery solved:
means an event is in the future and
means it was in the past, so
means it's happening now ("it's on!")
The three emojis apparently were in the original set, and predate even the smiley emoji. Seems like no one knows what it means anymore. Interesting!
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If you flick it horizontally it changes to off.
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or
have more meaning (usually something Japanese) behind them, but as far as I can tell,