During the Second World War, Free French forces and the French Resistance adopted the Cross of Lorraine as their symbol. The famous “peace sign” was first used as a logo for the British Campaign for Nuclear Disarmament in the 50s. The “Black Power” movement of the 60s used the traditional raised fist (a black one, naturally) as a symbol. Women’s Liberation used the fist as well, but put it inside the circle and cross symbol that normally signified women or females. The “Gay Pride” movement chose a rainbow flag to rally around. Earlier this year, millions of women around the world wore pink knit hats to unite the hundreds of marches into one single rally.
If the many different factions that oppose Trump and Trumpism are going to ever unite, they are going to need some sort of sign or symbol to link them together.