LUREF - ESRI:115886

WKT

VERTCS["LUREF", 
	DATUM["D_Luxembourg_Reference_Frame", 
		SPHEROID["International_1924", 6378388.0, 297.0]], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["LUREF", 
	DATUM["D_Luxembourg_Reference_Frame", 
		ELLIPSOID["International_1924", 6378388.0, 297.0]], 
	CS[vertical, 1], 
	AXIS["Ellipsoidal height (h)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["Esri", "115886"]]

Data from @esri/proj-codes

{
  "wkid": 115886,
  "latestWkid": 115886,
  "macro": "PE_VCS_LUREF",
  "name": "LUREF",
  "wkt": "VERTCS[\"LUREF\",DATUM[\"D_Luxembourg_Reference_Frame\",SPHEROID[\"International_1924\",6378388.0,297.0]],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"LUREF\",DATUM[\"D_Luxembourg_Reference_Frame\",ELLIPSOID[\"International_1924\",6378388.0,297.0]],CS[vertical,1],AXIS[\"Ellipsoidal height (h)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"Esri\",\"115886\"]]",
  "description": "LUREF",
  "authority": "Esri",
  "version": "13.2.0",
  "deprecated": "no",
  "areaname": "Luxembourg",
  "extent": {
    "slat": 49.44,
    "nlat": 50.19,
    "llon": 5.73,
    "rlon": 6.53
  }
}