St. Helena Tritan - EPSG:7881

WKT

GEOGCS["St_Helena_Tritan", 
	DATUM["St_Helena_Tritan", 
		SPHEROID["WGS_1984", 6378137.0, 298.257223563]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["St_Helena_Tritan", 
	DATUM["St_Helena_Tritan", 
		ELLIPSOID["WGS_1984", 6378137.0, 298.257223563]], 
	PRIMEM["Greenwich", 0.0], 
	CS[ellipsoidal, 2], 
	AXIS["Latitude (lat)", north, 
		ORDER[1]], 
	AXIS["Longitude (lon)", east, 
		ORDER[2]], 
	ANGLEUNIT["Degree", 0.0174532925199433], 
	ID["EPSG", "7881"]]

Data from @esri/proj-codes

{
  "wkid": 7881,
  "latestWkid": 7881,
  "macro": "PE_GCS_ST_HELENA_TRITAN",
  "name": "St_Helena_Tritan",
  "wkt": "GEOGCS[\"St_Helena_Tritan\",DATUM[\"St_Helena_Tritan\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"St_Helena_Tritan\",DATUM[\"St_Helena_Tritan\",ELLIPSOID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433],ID[\"EPSG\",\"7881\"]]",
  "description": "St. Helena Tritan",
  "authority": "EPSG",
  "version": "9.0(10.5.1)",
  "deprecated": "no",
  "areaname": "St Helena - St Helena Island",
  "extent": {
    "slat": -16.08,
    "nlat": -15.85,
    "llon": -5.85,
    "rlon": -5.59
  }
}