TIL how to read freaky pneumatic valve hieroglyphics
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Pneumatic Circuit Symbols Explained
https://library.automationdirect.com/pneumatic-circuit-symbols-explained/
Directional air control valves are the building blocks of pneumatic control. Pneumatic circuit symbols representing these valves provide detailed information about the valve they represent.
This may be pretty niche, but if you've ever shopped for valves you've probably seen these weird symbols. Turns out they can be read, and they do mean something! I mean, I think words would work too, but all the power to valve people.