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I'm fairly certain you are referring to the P suborbital. This is a suborbital within an electron orbital level, and contains 6 electrons, 3 pairs. I believe its a bar bell shaped orbital, but I could be wrong.

You also might be referring to the group of elements on the Periodic Table in families III-VIII. They are there because they all have empty P level suborbitals.

What else can I help you with?