# Namespaces Retro organizes words into *namespaces*. These are short prefix strings at the start of a word name. The primary namespaces are: `ASCII:` Holds ASCII character constants for control characters `buffer:` Contains words for operating on a simple linear LIFO buffer. `c:` Contains words for operating on ASCII character data. `class:` Contains class handlers for words. `d:` Contains words operating on the Dictionary. `err:` Contains words for handling errors. `n:` Contains words operating on numeric data. `prefix:` Contains prefix handlers. `s:` Contains words operating on string data. `set:` Contains words operating on sets (simple arrays) `v:` Contains words operating on variables.