WGS 1984 Major Auxiliary Web Mercator (DEPRECATED) - EPSG:3785

WKT

PROJCS["WGS_1984_Web_Mercator", 
	GEOGCS["GCS_WGS_1984_Major_Auxiliary_Sphere", 
		DATUM["D_WGS_1984_Major_Auxiliary_Sphere", 
			SPHEROID["WGS_1984_Major_Auxiliary_Sphere", 6378137.0, 0.0]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Mercator"], 
	PARAMETER["False_Easting", 0.0], 
	PARAMETER["False_Northing", 0.0], 
	PARAMETER["Central_Meridian", 0.0], 
	PARAMETER["Standard_Parallel_1", 0.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["WGS_1984_Web_Mercator", 
	BASEGEOGCRS["GCS_WGS_1984_Major_Auxiliary_Sphere", 
		DATUM["D_WGS_1984_Major_Auxiliary_Sphere", 
			ELLIPSOID["WGS_1984_Major_Auxiliary_Sphere", 6378137.0, 0.0]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Mercator", 
		METHOD["Mercator"], 
		PARAMETER["False_Easting", 0.0], 
		PARAMETER["False_Northing", 0.0], 
		PARAMETER["Central_Meridian", 0.0], 
		PARAMETER["Standard_Parallel_1", 0.0]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "3785"]]

Data from @esri/proj-codes

{
  "wkid": 3785,
  "latestWkid": 3785,
  "gcsWkid": 4055,
  "macro": "PE_PCS_WGS_1984_WEB_MERCATOR",
  "name": "WGS_1984_Web_Mercator",
  "wkt": "PROJCS[\"WGS_1984_Web_Mercator\",GEOGCS[\"GCS_WGS_1984_Major_Auxiliary_Sphere\",DATUM[\"D_WGS_1984_Major_Auxiliary_Sphere\",SPHEROID[\"WGS_1984_Major_Auxiliary_Sphere\",6378137.0,0.0]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Mercator\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",0.0],PARAMETER[\"Standard_Parallel_1\",0.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"WGS_1984_Web_Mercator\",BASEGEOGCRS[\"GCS_WGS_1984_Major_Auxiliary_Sphere\",DATUM[\"D_WGS_1984_Major_Auxiliary_Sphere\",ELLIPSOID[\"WGS_1984_Major_Auxiliary_Sphere\",6378137.0,0.0]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Mercator\",METHOD[\"Mercator\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",0.0],PARAMETER[\"Standard_Parallel_1\",0.0]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"3785\"]]",
  "description": "WGS 1984 Major Auxiliary Web Mercator (DEPRECATED)",
  "authority": "EPSG",
  "version": "6.18.3(10.1.0)",
  "deprecated": "yes",
  "areaname": "World - 85~S to 85~N",
  "extent": {
    "slat": -85.06,
    "nlat": 85.06,
    "llon": -180,
    "rlon": 180
  }
}