Airy modified (deprecated) - EPSG:4002

WKT

GEOGCS["GCS_Airy_Modified", 
	DATUM["D_Airy_Modified", 
		SPHEROID["Airy_Modified", 6377340.189, 299.3249646]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_Airy_Modified", 
	DATUM["D_Airy_Modified", 
		ELLIPSOID["Airy_Modified", 6377340.189, 299.3249646]], 
	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", "4002"]]

Data from @esri/proj-codes

{
  "wkid": 4002,
  "latestWkid": 4002,
  "macro": "PE_GCS_AIRY_MOD",
  "name": "GCS_Airy_Modified",
  "wkt": "GEOGCS[\"GCS_Airy_Modified\",DATUM[\"D_Airy_Modified\",SPHEROID[\"Airy_Modified\",6377340.189,299.3249646]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_Airy_Modified\",DATUM[\"D_Airy_Modified\",ELLIPSOID[\"Airy_Modified\",6377340.189,299.3249646]],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\",\"4002\"]]",
  "description": "Airy modified (deprecated)",
  "authority": "EPSG",
  "version": "3.0(13.2.0)",
  "deprecated": "yes",
  "areaname": "Not specified",
  "extent": {
    "slat": -90,
    "nlat": 90,
    "llon": -180,
    "rlon": 180
  }
}