IGb00 - EPSG:9009

WKT

GEOGCS["IGb00", 
	DATUM["IGb00", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["IGb00", 
	DYNAMIC[
		FRAMEEPOCH[1998.0]], 
	DATUM["IGb00", 
		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", "9009"]]

Data from @esri/proj-codes

{
  "wkid": 9009,
  "latestWkid": 9009,
  "macro": "PE_GCS_IGB00",
  "name": "IGb00",
  "wkt": "GEOGCS[\"IGb00\",DATUM[\"IGb00\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"IGb00\",DYNAMIC[FRAMEEPOCH[1998.0]],DATUM[\"IGb00\",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\",\"9009\"]]",
  "description": "IGb00",
  "authority": "EPSG",
  "version": "9.6.3(10.8.0)",
  "deprecated": "no",
  "areaname": "World",
  "extent": {
    "slat": -90,
    "nlat": 90,
    "llon": -180,
    "rlon": 180
  },
  "frameEpoch": 1998,
  "deformationModel": ""
}