Everest - India and Nepal - ESRI:37203

WKT

GEOGCS["GCS_Everest_India_Nepal", 
	DATUM["D_Everest_India_Nepal", 
		SPHEROID["Everest_Definition_1962", 6377301.243, 300.8017255]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_Everest_India_Nepal", 
	DATUM["D_Everest_India_Nepal", 
		ELLIPSOID["Everest_Definition_1962", 6377301.243, 300.8017255]], 
	PRIMEM["Greenwich", 0.0], 
	CS[ellipsoidal, 2], 
	AXIS["Longitude (lon)", east, 
		ORDER[1]], 
	AXIS["Latitude (lat)", north, 
		ORDER[2]], 
	ANGLEUNIT["Degree", 0.0174532925199433], 
	ID["Esri", "37203"]]

Data from @esri/proj-codes

{
  "wkid": 37203,
  "latestWkid": 37203,
  "macro": "PE_GCS_EVEREST_INDIA_NEPAL",
  "name": "GCS_Everest_India_Nepal",
  "wkt": "GEOGCS[\"GCS_Everest_India_Nepal\",DATUM[\"D_Everest_India_Nepal\",SPHEROID[\"Everest_Definition_1962\",6377301.243,300.8017255]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_Everest_India_Nepal\",DATUM[\"D_Everest_India_Nepal\",ELLIPSOID[\"Everest_Definition_1962\",6377301.243,300.8017255]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Longitude (lon)\",east,ORDER[1]],AXIS[\"Latitude (lat)\",north,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433],ID[\"Esri\",\"37203\"]]",
  "description": "Everest - India and Nepal",
  "authority": "Esri",
  "version": "4.0.0",
  "deprecated": "no",
  "areaname": "India",
  "extent": {
    "slat": 3.87,
    "nlat": 35.51,
    "llon": 65.6,
    "rlon": 97.42
  }
}