Columbus (also known as Tomahawk, Zeus or CTZ. It's a long story involving copyright infringement and legal battles). Is included in the Three C hops with Cascade and Centennial. It's traditionally used as a bittering hop, but can also be used for flavour and aroma. It has an aroma is described as peppery with pine, citrus and licorice notes.
You can use it to add an characterful bitterness to your beer or give a pungent note to your IPA.