Clojure defines symbols (keywords inherit the same behavior) to include the following:
Symbols begin with a non-numeric character and can contain alphanumeric characters and *, +, !, -, _, ', ?, <, > and = (other characters may be allowed eventually).
Clojure treats "non-numeric character" and "alphanumeric characters" to include pretty much any Unicode character. This includes the various Unicode whitespace characters.
; Supported for symbols.
user=> (def 😁 :smile)
#'user/😁
; Supported for keywords.
user=> (def fqkw :🙃/😁)
#'user/fqkw
user=> fqkw
:🙃/😁
; Even Unicode whitespace characters are supported.
user=> (def 2)
#'user/
user=>
2
Clojure defines symbols (keywords inherit the same behavior) to include the following:
Clojure treats "non-numeric character" and "alphanumeric characters" to include pretty much any Unicode character. This includes the various Unicode whitespace characters.