Can anyone tell me what this design means? [I Am Curious]

UPDATE: thank you for all your responses, either correct or interesting! PISCES. Got it!

I saw this on a tee shirt and I would like to know what it is supposed to be other than an H.

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NightsWatch · M

It is the symbol on a button to shut the Draft Eliminator On nuclear power plant cooling towers.

[image/video deleted]

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