U is a real stumper for me. I can't believer that I didn't have a decent U pic such as an umbrella or I don't know I can't think of too many nouns that begin with a U. Universe maybe.
So I got on Flickr and looked for "Untagged" and I came up with both Untagged and Unidentified.
I have no idea what this is. I have a vague sense that it is just east of downtown Tulsa but that is about it.
Are you prepared to present a U photo if you had to?