Credit:
We know iOS by version numbers, as in iOS 4.2.3, iOS 5.0, and so on. Turns out Apple is also using codenames to refer to its platform revisions, as unveiled by developer Steve Troughton-Smith. Here are the codenames listed right next to the version number:
iOS 1.0: Alpine (1.0.0 – 1.0.2: Heavenly)
iOS 1.1: Little Bear (1.1.1: Snowbird, 1.1.2: Oktoberfest)
iOS 2.0: Big Bear
iOS 2.1: Sugarbowl
iOS 2.2: Timberline
iOS 3.0: Kirkwood
iOS 3.1: Northstar
iOS 3.2: Wildcat (iPad only)
iOS 4.0: Apex
iOS 4.1: Baker
iOS 4.2: Jasper (iOS 4.2.5 – 4.2.10: Phoenix)
iOS 4.3: Durango
iOS 5.0: Telluride
iOS 5.1: Hoodoo
File this under "miscellaneous."