This glossary was compiled by Don B at jaguarforums.com and is reproduced here
with his permission
X-Type = Jaguar compact saloon range produced 2001-2009 (X400) based on Ford CD132 platform
X100 = Jaguar project code for XK8/XKR GTs produced 1995-2005 (replaced the XJS)
X150 = Jaguar project code for 2nd gen. XK8/XKR produced 2005-2014 (facelifted 2011)
X200 = Jaguar project code for S-Type (Modern) produced 1999-2002
X202 = Jaguar project code for S-Type (Modern) produced 2002-04
X204 = Jaguar project code for S-Type (Modern) produced 2004-06
X206 = Jaguar project code for S-Type (Modern) produced 2006-08
X250 = Jaguar project code for XF & XFR from 2008 (replaced S-Type)
X300 = Jaguar project code for XJ6/XJR saloon range produced 1995-1997 (replaced the XJ40)
X305 = XJ12 12-cylinder version of the X300 saloon
X306 = XJR6 S/C version of the X300 saloon
X308 = Jaguar project code for XJ8/XJR saloon range produced 1998-2003 (replaced the X300)
X330 = LWB version of the X308
X350 = Jaguar project code for aluminum bodied XJ8/XJR range produced 2004-?????
X350 XJ6 = Reintroduction of a 6-cylinder saloon with a 3.0L V6 engine
X351 = Jaguar project code for current XJ range from 2009 (replaced the X358)
X358 = Facelifted version of the X350 produced from 2007-2009
X400 = Jaguar project code for the X-Type compact saloon range produced 2001-2009
X760 = Jaguar project code for XE compact saloon range produced from 2015
X761 = Jaguar project code for F-Pace Crossover Utility Vehicle (based on C-X17 concept ) from 2016
XK120 = Jaguar sports car produced from 1948-54, heir to the SS100 which ceased production in 1940
XK120-C = Better known as the C-Type, racing car produced 1951-53, Le Mans winner 1951 & 1953
XK140 = Jaguar sports car produced 1954-57, successor to the XK120
XK150 = Jaguar sports car produced 1957-61, replaced by the E-Type
XK8 / XKR = Jaguar GT produced 1995-2005 (X100), and 2005-14 (X150)
XK-E or XKE = U.S. designation for the E-Type, Jaguar range of sports cars produced from 1961 to 1975
XKSS = 1957 road-legal sports car produced from complete and unfinished D-Type racing cars
XJ12 = 12-cylinder version of XJ saloon (XJ12, XJ81, X305)
XJ12C = 12-cylinder 2-door coupe version of the Series II XJ saloon produced 1975-77
XJ220 = 2-seat Jaguar supercar produced 1992-94, fastest production car in the world when released
XJ40 = Jaguar project code for XJ6/XJR saloon range produced from 1987-1994
XJ6 = Jaguar saloon range 1968-73 (Series I or 1); 1974-79 (Series II or 2); 1979-92 (Series III or 3)
XJ6C = 2-door coupe version of the Series II XJ saloon
XJ81 = Jaguar project code for 12-cylinder version of XJ40 saloon; Daimler Double Six (U.K.); XJ12 (U.S.)
XJ-S / XJS = Jaguar GT produced 1975-96 (replaced the E-Type)
X-Type = Jaguar compact saloon range produced 2001-2009 (X400) based on Ford CD132 platform
