ETRF90 - EPSG:9060

WKT

GEOGCS["ETRF90", 
	DATUM["European_Terrestrial_Reference_Frame_1990", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["ETRF90", 
	DYNAMIC[
		FRAMEEPOCH[1989.0]], 
	DATUM["European_Terrestrial_Reference_Frame_1990", 
		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], 
	ID["EPSG", "9060"]]

Data from @esri/proj-codes

{
  "wkid": 9060,
  "latestWkid": 9060,
  "macro": "PE_GCS_ETRF_1990",
  "name": "ETRF90",
  "wkt": "GEOGCS[\"ETRF90\",DATUM[\"European_Terrestrial_Reference_Frame_1990\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"ETRF90\",DYNAMIC[FRAMEEPOCH[1989.0]],DATUM[\"European_Terrestrial_Reference_Frame_1990\",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],ID[\"EPSG\",\"9060\"]]",
  "description": "ETRF90",
  "authority": "EPSG",
  "version": "9.7(10.8.0)",
  "deprecated": "no",
  "extent": [
    {
      "areaname": "Europe - ETRF",
      "slat": 33.26,
      "nlat": 84.73,
      "llon": -16.1,
      "rlon": 38.01
    }
  ],
  "frameEpoch": 1989,
  "deformationModel": ""
}