World - EPSG:6893

WKT

HVCOORDSYS["HVC_WGS_1984_World_Mercator_and_EGM2008_height", 
	PROJCS["WGS_1984_World_Mercator", 
		GEOGCS["GCS_WGS_1984", 
			DATUM["D_WGS_1984", 
				SPHEROID["WGS_1984", 6378137.0, 298.257223563]], 
			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]], 
	VERTCS["EGM2008_height", 
		VDATUM["EGM2008_Geoid"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", 1.0], 
		UNIT["Meter", 1.0]]]

WKT2

COMPOUNDCRS["HVC_WGS_1984_World_Mercator_and_EGM2008_height", 
	PROJCRS["WGS_1984_World_Mercator", 
		BASEGEOGCRS["GCS_WGS_1984", 
			DYNAMIC[
				FRAMEEPOCH[1990.5], 
				MODEL["AM0-2"]], 
			DATUM["D_WGS_1984", 
				ELLIPSOID["WGS_1984", 6378137.0, 298.257223563]], 
			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]], 
	VERTCRS["EGM2008_height", 
		VDATUM["EGM2008_Geoid"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", up, 
			LENGTHUNIT["Meter", 1.0]]], 
	ID["EPSG", "6893"]]

Data from @esri/proj-codes

{
  "wkid": 6893,
  "latestWkid": 6893,
  "pcsWkid": 3395,
  "gcsWkid": 4326,
  "vcsWkid": 3855,
  "macro": "PE_HVC_WGS_1984_WORLD_MERCATOR_EGM2008_HT",
  "name": "HVC_WGS_1984_World_Mercator_and_EGM2008_height",
  "wkt": "HVCOORDSYS[\"HVC_WGS_1984_World_Mercator_and_EGM2008_height\",PROJCS[\"WGS_1984_World_Mercator\",GEOGCS[\"GCS_WGS_1984\",DATUM[\"D_WGS_1984\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],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]],VERTCS[\"EGM2008_height\",VDATUM[\"EGM2008_Geoid\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]]",
  "wkt2": "COMPOUNDCRS[\"HVC_WGS_1984_World_Mercator_and_EGM2008_height\",PROJCRS[\"WGS_1984_World_Mercator\",BASEGEOGCRS[\"GCS_WGS_1984\",DYNAMIC[FRAMEEPOCH[1990.5],MODEL[\"AM0-2\"]],DATUM[\"D_WGS_1984\",ELLIPSOID[\"WGS_1984\",6378137.0,298.257223563]],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]],VERTCRS[\"EGM2008_height\",VDATUM[\"EGM2008_Geoid\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]]],ID[\"EPSG\",\"6893\"]]",
  "description": "World",
  "authority": "EPSG",
  "version": "8.5.1(10.8.0)",
  "deprecated": "no",
  "areaname": "World",
  "extent": {
    "slat": -90,
    "nlat": 90,
    "llon": -180,
    "rlon": 180
  }
}