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's a list of all the Apple iOS codenames. All current and future iOS versions will be tagged with the proper codename.
1.0 : "Alpine"
1.0.2 : "Heavenly"
1.1 : "Little Bear"
1.1.1 : "Snowbird"
1.1.2 : "Oktoberfest"
2.0 : "Big Bear"
2.1 : "Sugarbowl"
2.2 : "Timberline"
3.0 : "Kirkwood"
3.1 : "Northstar"
3.2 : "Wildcat"
4.0 : "Apex"
4.1 : "Baker"
4.2 : "Jasper"
4.2.5 : "Phoenix"
4.3 : "Durango"
5.0 : "Telluride"
5.1 : "Hoodoo"