Opel 2016 KARL Owner's Manual page 51

IL : suitable for particular ISOFIX restraint systems of the "specific-vehicle", "restricted" or "semi-universal" categories.
The ISOFIX restraint system must be approved for the specific vehicle type (refer to the vehicle type list of the child
restraint system)
IUF : suitable for ISOFIX forward-facing child restraint systems of universal category approved for use in this weight class
X : no ISOFIX child restraint system approved for this weight class
: only applicable for rear outer seat on passenger side with foremost seating position and backrest upright.
1
Note
Move the driver and/or passenger seat forwards and adjust seat backrest inclination as far as necessary to a vertical
position to ensure that the child restraint system does not have any interference from the front seat backrest.
ISOFIX size class and seat device
A – ISO/F3 : forward-facing child restraint system for children of maximum size in the weight class 9 to 18 kg
B – ISO/F2 : forward-facing child restraint system for smaller children in the weight class 9 to 18 kg
B1 – ISO/F2X : forward-facing child restraint system for smaller children in the weight class 9 to 18 kg
C – ISO/R3 : rear-facing child restraint system for children of maximum size in the weight class up to 18 kg
D – ISO/R2 : rear-facing child restraint system for smaller children in the weight class up to 18 kg
E – ISO/R1 : rear-facing child restraint system for young children in the weight class up to 13 kg
F - ISO/L1 : left lateral facing position CRS (carry cot) for smaller children in the weight class up to 10 kg
G - ISO/L2 : right lateral facing position CRS (carry cot) for smaller children in the weight class up to 10 kg.
Seats, restraints 49