It's widely known that most of Cyan's texture abbreviations go like this:
the first four letters in the name of a texture are an internal abbreviation for the age name. So a Teledahn texture would say be: "tldnRandomImage"
Great Zero: "grtzRandomImage"
for global textures that are not age specific, you have the name starting with an x. So for instance a texture related to the KI would be: "xRandomImageForTheKI"
or a journey cloth: "xRandomJourneyClothImage"
Now. Here's my big question. if you go by their naming scheme. City textures specifically have the abbreviation "islm" for the first four letters of the image's name. What the heek does "islm" stand for?