RDN2008 - EPSG:6706

WKT

GEOGCS["GCS_RDN2008", 
	DATUM["D_Rete_Dinamica_Nazionale_2008", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_RDN2008", 
	DATUM["D_Rete_Dinamica_Nazionale_2008", 
		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], 
	ID["EPSG", "6706"]]

Data from @esri/proj-codes

{
  "wkid": 6706,
  "latestWkid": 6706,
  "macro": "PE_GCS_RDN2008",
  "name": "GCS_RDN2008",
  "wkt": "GEOGCS[\"GCS_RDN2008\",DATUM[\"D_Rete_Dinamica_Nazionale_2008\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_RDN2008\",DATUM[\"D_Rete_Dinamica_Nazionale_2008\",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],ID[\"EPSG\",\"6706\"]]",
  "description": "RDN2008",
  "authority": "EPSG",
  "version": "8.3.3(10.3.1)",
  "deprecated": "no",
  "areaname": "Italy - including San Marino and Vatican",
  "extent": {
    "slat": 34.76,
    "nlat": 47.1,
    "llon": 5.93,
    "rlon": 18.99
  }
}