What am I?

I am a number with a couple of friends, quarter a dozen, and you'll find me again. What am I?

related riddles

I have no eyes, no legs or ears and I help move the earth. What am I?

As a state in America. I am round on both sides and high in the middle. What am I?

I am the ruler of shovels, I have a double, I am as thin as a knife, I have a wife. What am I?