YXPCCCTT
From SnesLab
The YXPCCCTT format (not to be confused with the YXPPCCCT format) is used to store layer tilemap properites. The information is stored in binary and makes up a single byte. Format
76543210 YXPCCCTT X : X flip Y : Y flip P : Priority CCC: Palette TT : Bits 9 and 8 of tile number