A color code between 0-9 or a-f.
Set to 'none' to disable.
Essentials Sign Control
See http://wiki.ess3.net/wiki/Sign_Tutorial for instructions on how to use these.
To enable signs, remove # symbol. To disable all signs, comment/remove each sign.
Essentials colored sign support will be enabled when any sign types are enabled.
Color is not an actual sign, it's for enabling using color codes on signs, when the correct permissions are given.