The scales of justice is a symbol used in many Western presentations of modern law. They symbolize the idea of the fair distribution of law, with no influence of bias, privilege or corruption.
The scales are held usually by Lady Justice, also known as the Lady of Justice, a very common figure in Western modern law. She is sometimes depicted with a blindfold, and most times in flowing robes holding a sword along with her scale.
There are many possible origins behind Lady Justice, according to commonlaw.com, a law reference website. Many goddesses and deities that represent justice have been depicted with a sword or a scale.
A Greek goddess named Themis, was said to have advised Zeus and carried a scale and sword whilst blindfolded. European presentations of Lady Justice commonly show her blindfolded while other Western presentations do not.