Revelation 1:20 “The mystery of the seven stars which you saw in My right hand, and the seven golden lampstands: The seven stars are the angels of the seven churches, and the seven lampstands which you saw are the seven churches.
Our Lord gives John an explanation as to what the nature of the stars and lampstands are, so as not to leave the apostle (or us) in the dark. Christ is expositing His own word so that we may clearly understand the symbolism being invoked. And to be transparent, yes, symbolism is used in Revelation.