The World Atlas of Language Structures is “a large database of structural (phonological, grammatical, lexical) properties of languages”.
For example, in some languages certain pronouns are used for politeness. The atlas classifies languages according to second person pronouns that:
- encode no politeness distinction (e.g. English, Swahili)
- encode a binary politeness distinction (e.g. German, Russian, Mandarin)
- encode multiple politeness distinctions (e.g. Hindi, Hungarian)
- are dominantly avoided for politeness reasons (e.g. Japanese, Vietnamese, Indonesian).
You can see the distribution of these four on a map.