ITRF2005 + SA LLD height - EPSG:9543

WKT

HVCOORDSYS["ITRF2005_and_SA_LLD_height", 
	GEOGCS["GCS_ITRF_2005", 
		DATUM["D_ITRF_2005", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	VERTCS["SA_LLD_height", 
		VDATUM["South_Africa_Land_Levelling_Datum"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", 1.0], 
		UNIT["Meter", 1.0]]]

WKT2

COMPOUNDCRS["ITRF2005_and_SA_LLD_height", 
	GEOGCRS["GCS_ITRF_2005", 
		DYNAMIC[
			FRAMEEPOCH[2000.0], 
			MODEL["NNR-NUVEL1A+ITRF2005-PMM"]], 
		DATUM["D_ITRF_2005", 
			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]], 
	VERTCRS["SA_LLD_height", 
		VDATUM["South_Africa_Land_Levelling_Datum"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", up, 
			LENGTHUNIT["Meter", 1.0]]], 
	ID["EPSG", "9543"]]

Data from @esri/proj-codes

{
  "wkid": 9543,
  "latestWkid": 9543,
  "pcsWkid": 0,
  "gcsWkid": 8998,
  "vcsWkid": 9279,
  "macro": "PE_HVC_ITRF2005_SA_LLD_HEIGHT",
  "name": "ITRF2005_and_SA_LLD_height",
  "wkt": "HVCOORDSYS[\"ITRF2005_and_SA_LLD_height\",GEOGCS[\"GCS_ITRF_2005\",DATUM[\"D_ITRF_2005\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],VERTCS[\"SA_LLD_height\",VDATUM[\"South_Africa_Land_Levelling_Datum\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]]",
  "wkt2": "COMPOUNDCRS[\"ITRF2005_and_SA_LLD_height\",GEOGCRS[\"GCS_ITRF_2005\",DYNAMIC[FRAMEEPOCH[2000.0],MODEL[\"NNR-NUVEL1A+ITRF2005-PMM\"]],DATUM[\"D_ITRF_2005\",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]],VERTCRS[\"SA_LLD_height\",VDATUM[\"South_Africa_Land_Levelling_Datum\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]]],ID[\"EPSG\",\"9543\"]]",
  "description": "ITRF2005 + SA LLD height",
  "authority": "EPSG",
  "version": "10.013(13.2.0)",
  "deprecated": "no",
  "areaname": "South Africa - onshore",
  "extent": {
    "slat": -34.88,
    "nlat": -22.13,
    "llon": 16.45,
    "rlon": 32.95
  }
}