![[ATLISP]](https://atlisp.cn/assets/layout/images/logo-white.png)
Constituent characters are used in tokens. A token is a representation of a number or a symbol. Examples of constituent characters are letters and digits.
Letters in symbol names are sometimes converted to letters in the opposite case when the name is read; see Section 23.1.2 (Effect of Readtable Case on the Lisp Reader). Case conversion can be suppressed by the use of single escape or multiple escape characters.