PC Trying to make a texture pack with altered npc map icons

[TwiliWolf]

It's just what I said in the title. I am trying to make a custom npc map icon for a texture pack but I can't find the file name for the npc map icons. Does anyone know what the file names for those are? (I've already used Tconvert to see the terraria image files but I can't find the npc map icon files)