X resources are configuration options for X applications such as rxvt-unicode. They can also be used for setting the cursor theme. X resources can be set in ~/.Xresources. Most display managers automatically load this configuration file on startup.
Configuration options in the ~/.Xresources file should respect the following syntax:
name.resource: value (for example
Constants can be defined in the following way:
#define name value (for example
#define black #000000).
Comments start with an exclamation mark.