What is the symbol of there will come soft rains?

The robots represent mans attempt to be a god, which happened to fail miserably when Bradbury writes "the house was like and altar, with 9000 robot attendants.... but the gods had gone away" this shows that man is trying to be a god, and is having an attempt at creating "life", which fails, and in the end it is the same technology that kills him. The house being an altar is a symbol, and the robots attendants are a symbol.