NAD 1983 StatePlane Guam FIPS 5400 (US Feet) - ESRI:102766

WKT

PROJCS["NAD_1983_StatePlane_Guam_FIPS_5400_Feet", 
	GEOGCS["GCS_North_American_1983", 
		DATUM["D_North_American_1983", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Polyconic"], 
	PARAMETER["False_Easting", 164041.6666666666], 
	PARAMETER["False_Northing", 164041.6666666666], 
	PARAMETER["Central_Meridian", 144.7487507055556], 
	PARAMETER["Latitude_Of_Origin", 13.47246635277778], 
	UNIT["Foot_US", 0.3048006096012192]]

WKT2

PROJCRS["NAD_1983_StatePlane_Guam_FIPS_5400_Feet", 
	BASEGEOGCRS["GCS_North_American_1983", 
		DATUM["D_North_American_1983", 
			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]], 
	CONVERSION["Polyconic", 
		METHOD["Polyconic"], 
		PARAMETER["False_Easting", 164041.6666666666, 
			LENGTHUNIT["Foot_US", 0.3048006096012192]], 
		PARAMETER["False_Northing", 164041.6666666666, 
			LENGTHUNIT["Foot_US", 0.3048006096012192]], 
		PARAMETER["Central_Meridian", 144.7487507055556], 
		PARAMETER["Latitude_Of_Origin", 13.47246635277778]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Foot_US", 0.3048006096012192], 
	ID["Esri", "102766"]]

Data from @esri/proj-codes

{
  "wkid": 102766,
  "latestWkid": 102766,
  "gcsWkid": 4269,
  "macro": "PE_PCS_NAD_1983_GU_FT",
  "name": "NAD_1983_StatePlane_Guam_FIPS_5400_Feet",
  "wkt": "PROJCS[\"NAD_1983_StatePlane_Guam_FIPS_5400_Feet\",GEOGCS[\"GCS_North_American_1983\",DATUM[\"D_North_American_1983\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Polyconic\"],PARAMETER[\"False_Easting\",164041.6666666666],PARAMETER[\"False_Northing\",164041.6666666666],PARAMETER[\"Central_Meridian\",144.7487507055556],PARAMETER[\"Latitude_Of_Origin\",13.47246635277778],UNIT[\"Foot_US\",0.3048006096012192]]",
  "wkt2": "PROJCRS[\"NAD_1983_StatePlane_Guam_FIPS_5400_Feet\",BASEGEOGCRS[\"GCS_North_American_1983\",DATUM[\"D_North_American_1983\",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]],CONVERSION[\"Polyconic\",METHOD[\"Polyconic\"],PARAMETER[\"False_Easting\",164041.6666666666,LENGTHUNIT[\"Foot_US\",0.3048006096012192]],PARAMETER[\"False_Northing\",164041.6666666666,LENGTHUNIT[\"Foot_US\",0.3048006096012192]],PARAMETER[\"Central_Meridian\",144.7487507055556],PARAMETER[\"Latitude_Of_Origin\",13.47246635277778]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Foot_US\",0.3048006096012192],ID[\"Esri\",\"102766\"]]",
  "description": "NAD 1983 StatePlane Guam FIPS 5400 (US Feet)",
  "authority": "Esri",
  "version": "8.0.1",
  "deprecated": "no",
  "areaname": "Guam",
  "extent": {
    "slat": 10.95,
    "nlat": 15.91,
    "llon": 141.19,
    "rlon": 148.18
  }
}