Fahud Height Datum 1993 - EPSG:5725

WKT

VERTCS["Fahud_Height_Datum_1993", 
	VDATUM["Fahud_Height_Datum"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["Fahud_Height_Datum_1993", 
	VDATUM["Fahud_Height_Datum"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "5725"]]

Data from @esri/proj-codes

{
  "wkid": 5725,
  "latestWkid": 5725,
  "macro": "PE_VCS_FAHUD_HEIGHT_DATUM_1993",
  "name": "Fahud_Height_Datum_1993",
  "wkt": "VERTCS[\"Fahud_Height_Datum_1993\",VDATUM[\"Fahud_Height_Datum\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"Fahud_Height_Datum_1993\",VDATUM[\"Fahud_Height_Datum\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"5725\"]]",
  "description": "Fahud Height Datum 1993",
  "authority": "EPSG",
  "version": "6.15(9.3.0.0)",
  "deprecated": "no",
  "areaname": "Oman - mainland",
  "extent": {
    "slat": 16.59,
    "nlat": 26.42,
    "llon": 51.99,
    "rlon": 59.91
  }
}