NN2000 height - EPSG:5941

WKT

VERTCS["NN2000_height", 
	VDATUM["Norway_Normal_Null_2000"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["NN2000_height", 
	DYNAMIC[
		FRAMEEPOCH[2000.0], 
		MODEL["Levelling-based"]], 
	VDATUM["Norway_Normal_Null_2000"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "5941"]]

Data from @esri/proj-codes

{
  "wkid": 5941,
  "latestWkid": 5941,
  "macro": "PE_VCS_NN2000_HT",
  "name": "NN2000_height",
  "wkt": "VERTCS[\"NN2000_height\",VDATUM[\"Norway_Normal_Null_2000\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"NN2000_height\",DYNAMIC[FRAMEEPOCH[2000.0],MODEL[\"Levelling-based\"]],VDATUM[\"Norway_Normal_Null_2000\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"5941\"]]",
  "description": "NN2000 height",
  "authority": "EPSG",
  "version": "8.1.1(10.2.0)",
  "deprecated": "no",
  "areaname": "Norway - onshore",
  "extent": {
    "slat": 57.9,
    "nlat": 71.24,
    "llon": 4.39,
    "rlon": 31.32
  },
  "frameEpoch": 2000,
  "deformationModel": "Levelling-based"
}