What am I?

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What am I?

I live above a star, and yet I do not burn. I have 11 neighbours, and yet none of them turn.

I live above a star, and yet I do not burn. I have 11 neighbours, and yet none of them turn. I am visited in sequence, first or last or in between. PQRS are my initials, now tell me what I am.

Answer
The number 7 on a phone keypad