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I'm not sure what you mean by this but there is a band called Petra who are Christian.
Petra (Christian rock band)
Petra Farewell is a Christian rock music album by the rock band Petra. It was released on November 22, 2005.
I forget if it's Hebrew or Greek, but in one of those languages "Petra" means "Rock" The Lord is my rock"
Petra means "a rock".