The raised fist, or solidarity fist is a symbol for a few different things depending on where you come from.

Most notably that could be socialism, communism, anarchism, trade unionism, but can also be used as a salute expressing unity, strength, or resistance.

Some also refer to it as the clenched fist or power fist.

While the size difference doesn’t seem huge, trust me, IRL, the bigger pin is notably bigger.