CITROËN C3 Handbook page 150

Safety
suitable for i-Size restraint systems of
i-U:
the "Universal" category, forward facing
or rearward facing.
i-UF: only suitable for i-Size restraint systems
in the "Universal" category, forward
facing.
X: seating position not suitable for i-Size
restraint systems in the "Universal"
category.
(a) Refer to the current legislation in your
country before installing a child at this
seating position.
148
Remove and stow the head restraint
before installing a child seat on a
passenger seat.
Refit the head restraint once the child
seat has been removed.