A raised fist goes back much further in history, at least to the French revolution, not sure about before that. Its always been a symbol of solidarity and anti-fascism. Eyes have been used as a symbol, as in bearing witness to whats going on. Keith Haring created some incredible iconography like the 3 eyed monster, barking dog, etc. Colors by themselves have been used to mark activism. Then you have more generic symbols that have been used, like a bullhorn, scales of justice, pitchforks, etc.