Well, Communism made it into Unicode (U+262D). I tried to show it here but it gets stripped.

I have it it in my .XCompose as

    <Multi_key> <c> <c> <c> <p> : "\xe2\x98\xad" #symbol representing proletarian solidarity between agricultural and industrial workers

As a slightly related tangent, The compose key mnemonic interface for rarely used characters is pretty great, beats trying to remember alt codes.

Figures, it's a capitalist website after all...