If you are into industrial and globalized signage / semiotics, do yourself a favor and check out the Symbol Sourcebook -- https://www.amazon.com/Symbol-Sourcebo

If you are into industrial and globalized signage / semiotics, do yourself a favor and check out the Symbol Sourcebook -- https://www.amazon.com/Symbol-Sourcebook-Authoritative-International-Graphic/dp/0471288721 https://www.amazon.com/Symbol-Sourcebook-Authoritative-Inter... Some of the symbolism they use for computer operations are fascinating