Appears 5 times in the Quran. (Root: كلل)
  1. And He taught Adam all the names, then presented them to the angels; then He said: Tell me the names of those if you are right.

  2. And truly We showed him Our signs, all of them, but he rejected and refused.

  3. Glory be to Him Who created pairs of all things, of what the earth grows, and of their kind and of what they do not know.

  4. And He Who created pairs of all things, and made for you of the ships and the cattle what you ride on,

  5. They rejected all Our communications, so We overtook them after the manner of a Mighty, Powerful One.