Child Restraint System for Vehicles with ISOFIX Anchorage System - Europe
ISOFIX Child Restraint System Seat Position Compatibility According to UN/ECE Regulation

IUF = Suitable for universal ISOFIX child restraint systems approved for forward-facing use in this group.
IL = Suitable for specific ISOFIX child restraint systems listed in the attached list. These ISOFIX restraints are categorized as "vehicle-specific," "restricted use," or "semi-universal."
X = ISOFIX position is not suitable for ISOFIX child restraint systems of this group and/or size class.
A - ISO/F3: Full-height forward-facing child restraint (height: 720 mm)
B - ISO/F2: Reduced-height forward-facing child restraint (height: 650 mm)
B1 - ISO/F2X: Reduced-height forward-facing child restraint with rear support, second variant (height: 650 mm)
C - ISO/R3: Full-height rearward-facing child restraint
D - ISO/R2: Reduced-height rearward-facing child restraint
E - ISO/R1: Rearward-facing child restraint
F - ISO/L1: Left-side child restraint (carrycot)
G - ISO/L2: Right-side child restraint (carrycot)
Test yourself
A quick Hyundai Tucson quiz: every answer comes with an explanation and a link to the manual page.