RSAO13 TM 12 SE - EPSG:9159

WKT

PROJCS["RSAO13_TM_12_SE", 
	GEOGCS["RSAO13", 
		DATUM["Reference_System_de_Angola_2013", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 500000.0], 
	PARAMETER["False_Northing", 10000000.0], 
	PARAMETER["Central_Meridian", 12.0], 
	PARAMETER["Scale_Factor", 0.9996], 
	PARAMETER["Latitude_Of_Origin", 0.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["RSAO13_TM_12_SE", 
	BASEGEOGCRS["RSAO13", 
		DATUM["Reference_System_de_Angola_2013", 
			ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Transverse_Mercator", 
		METHOD["Transverse_Mercator"], 
		PARAMETER["False_Easting", 500000.0], 
		PARAMETER["False_Northing", 10000000.0], 
		PARAMETER["Central_Meridian", 12.0], 
		PARAMETER["Scale_Factor", 0.9996], 
		PARAMETER["Latitude_Of_Origin", 0.0]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "9159"]]

Data from @esri/proj-codes

{
  "wkid": 9159,
  "latestWkid": 9159,
  "gcsWkid": 8699,
  "macro": "PE_PCS_RSAO13_TM_12_SE",
  "name": "RSAO13_TM_12_SE",
  "wkt": "PROJCS[\"RSAO13_TM_12_SE\",GEOGCS[\"RSAO13\",DATUM[\"Reference_System_de_Angola_2013\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",500000.0],PARAMETER[\"False_Northing\",10000000.0],PARAMETER[\"Central_Meridian\",12.0],PARAMETER[\"Scale_Factor\",0.9996],PARAMETER[\"Latitude_Of_Origin\",0.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"RSAO13_TM_12_SE\",BASEGEOGCRS[\"RSAO13\",DATUM[\"Reference_System_de_Angola_2013\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",500000.0],PARAMETER[\"False_Northing\",10000000.0],PARAMETER[\"Central_Meridian\",12.0],PARAMETER[\"Scale_Factor\",0.9996],PARAMETER[\"Latitude_Of_Origin\",0.0]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"9159\"]]",
  "description": "RSAO13 TM 12 SE",
  "authority": "EPSG",
  "version": "9.8(10.8.0)",
  "deprecated": "no",
  "areaname": "Angola - Angola proper - offshore",
  "extent": {
    "slat": -17.26,
    "nlat": -6.01,
    "llon": 8.2,
    "rlon": 13.86
  }
}