This is THE Column, framed in the entryway to the Temples of Rameses III, which is between the first and second pylons.

One thing to keep in mind: Rome wasn't built in a day, and these sorts of temples weren't all done at once, either. There are several different features and temples which bear the names of different Pharaohs from Egypt's long history. The Pharaohs went out of their way to make as many monuments and structures to themselves as they could, sometimes defacing the monuments of previous rulers with their own cartouches.

So, in Karnak, you'll have the Temples of Rameses III, the Obelisks of Thutmosis III, the Shrine of Seti II and all kinds of other do-dads from folks you've probably never heard of before.