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A comment on A comment on Hacker News led to 4½ new Unicode characters (2016). Parent comment

Re:A comment on Hacker News led to 4½ new Unicode characters... by Slartie on Tuesday December 03, 2019 @06:20AM (#21691490)
Filled circle means "vent is blocked, so no air can pass". Empty circle is an unblocked vent through which air can pass.
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Re:A comment on Hacker News led to 4½ new Unicode characters... by gmac on Tuesday December 03, 2019 @07:29AM (#21691764)
I think the problem is those meanings can plausibly be reversed, so it's hard to remember which way round it goes.

A better way to do it that I've seen is to represent air flow with wavy lines or similar on the 'open' symbol.

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Re:A comment on Hacker News led to 4½ new Unicode characters... by alecmg on Thursday December 05, 2019 @11:20AM (#21713545)
Pretty sure in the last car it was the opposite. Filled circle meant air was coming.

So you can see why this is confusing

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