From Second Life Wiki
TEXTURE_PLYWOOD
Description
Constant: string TEXTURE_PLYWOOD = "89556747-24cb-43ed-920b-47caed15465f";
The string constant TEXTURE_PLYWOOD has the value "89556747-24cb-43ed-920b-47caed15465f"
UUID for the default "Plywood" texture
Like any string constants longer then 3 characters and used in multiple places in the code, they should be store in a global variable. The result will be a considerable memory savings.
Constant: string TEXTURE_DEFAULT = "89556747-24cb-43ed-920b-47caed15465f";
The string constant TEXTURE_DEFAULT also has the value "89556747-24cb-43ed-920b-47caed15465f"
It can be used just like TEXTURE_PLYWOOD.