Occupational cryptolects

slang languages used by different people on the Internet

Rotwelsch (, "beggar's foreign (language)") or Gaunersprache ( "crook's language") also Khokhmer Loshn (from Yiddish "", "tongue of the wise") is a secret language, a cant or thieves' argot, spoken by groups (primarily marginalized groups) in Germany, Switzerland, Austria, and Bohemia. The language is based on a mix of Low German, Yiddish, Hebrew, Romani, Latin, and Czech with a High German substrate.

Spanish dialect

secret language, argot, employed by stonecutters in Galicia, Spain, particularly in the area of Pontevedra, based on the Galician language

' or ' () is Parisian and Lyonnaise butchers' (French ) slang, similar to Pig Latin and Verlan. It originated in the mid-19th century and was in common use until the 1950s.

Gacería, also known as briquería or briquero, is a linguistic variant whose core has its origins between the 12th and 13th centuries, it was especially rooted during the 19th and 20th centuries as cant and slang within the professional world of threshing and farming implement manufacturers, cattle dealers as well as other traditional commercial activities, although its use is not limited to work activity.

Klezmer-loshn ( klezmer-loshn, Yiddish for ''Musician's Tongue'') is an extinct derivative of the Yiddish language. It was a kind of argot, or cant used by travelling Jewish musicians, known as klezmorim (klezmers), in Eastern Europe prior to the 20th century.