Reputation: 8121
I know of a-z (A-Z), å (Å), ä (Ä), ö (Ö). But is there any official definition of which characters actually have a sibling in another case?
Upvotes: 1
Views: 117
Reputation: 111260
This is language specific. But do check out Case Mappings. This is part of the standard.
5.18 Case Mappings
Case is a normative property of characters in specific alphabets such as Latin, Greek, Cyrillic, Armenian, and archaic Georgian, whereby characters are considered to be variants of a single letter.
You may also want to check the European Alphabetic Scripts part for language specific information.
Upvotes: 2