[Silverfox]

Yep, those are what they mean. Here's a few more, just in case:

SE = Base model Caliber with the fewest options.
SXT = Luxury model Caliber with more options.
R/T = Competition model Caliber with the most options and most power.
SRT = Street Racing Technologies model Caliber with turbocharged engine and upgraded driveline.

 

[Silverfox]

WOT = Wide Open Throttle
SRS = Supplemental Restraint System
DOHC = Dual Overhead Cams
DIC = Driver Information Center
PAX = Passengers