What is a monospace font in iOS?

Question

I want a monospace font for my UILabel in my iOS application.

Unfortunately, I could not find one. Even \"American Typewriter\" was not actually monospaced. What is

Answer 1

Expanding upon @reggie-pinkham's answer, I built this JS Bin for folks to use as a live test page; to save future reader's some time, here's a few screen shots using iOS Simulator on Mavericks:

iPad Air, iOS 8.1

iPhone 6 plus, iOS 8.1