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A special texture, usually a 256-colour greyscale that is stored in decals.wad, that can be added to a textured brush to give signage to the brush or variety to the texture tiling. Custom decals to be added to the map should be placed in a custom WAD file with a program like Wally and then be merged into the final .bsp file with the CSG compiler's -wadinclude parameter. Check out SlayerA's tutorial on decals for more info.