What does this symbol represent?

This symbol means opposition to war! This is a world anti-war symbol, which means opposition to war

This symbol is a death symbol in the ancient Nordic Teutonic language. It was adopted as a "peace symbol" in 1960 and is still in use today.

Gerald Holtom, a supporter of the 1950 peace movement, may have been commissioned by communist Bertrand Russell to design a symbol to unite left-wingers in the 1958 peace movement. Apparently both Holtom and Russell thought the Teutonic Cross (also known as the Nero Cross) was an appropriate symbol to represent their cause.

Yet two thousand years ago to this day, this symbol was designed to hate Christians. Nero, a tyrant who despised Christians, crucified Saint Peter and turned the cross upside down. The shape of the Teutonic cross symbolized this horrific atrocity and became a very popular emblem among pagans at the time. Since then, this symbol has been called "Nero's Cross"