The codenames are the little nicknames used internally by Apple for each version of their operating system, here is the list.
Famous developer Steve Troughton-Smith, known for being the first to port Siri to devices other than the iPhone 4S, tweeted the codenames Apple has given to different iOS versions. As surprising as it may seem, it turns out that these codes are names of ski slopes! This practice is very common among manufacturers who prefer to remain discreet. Developers will rather talk about "Hoodoo" between them, this which is better known to us as iOS 5.1.
List of code names:
– 1.0: Alpine (1.0.0 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 (iPad only) – 4.0: Apex– 4.1: Baker– 4.2: Jasper (4.2.5 4.2.10: Phoenix) – 4.3: Durango– 5.0: Telluride– 5.1: Hoodoo
The first may not be unknown to you. When connecting in SSH, the username is root accompanied by the alpine password! We know that Google, them, use port names on food for all its Android versions and that Apple uses for all its Mac OS X versions of Felin like Snow Leopard or lately Lion.
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(Source TiPb | Thanks @Esdebebe for the info)