Volvo XC90 Owner's Manual page 39

Weight Front seat (with deactivated airbag)
Group 2/3 Booster cushion with and without backrest (Booster Cushion with and without backrest).
15-36 kg Type approval: E5 04216
(UF)
Group 2/3 Volvo booster seat with backrest (Volvo Booster Seat with backrest).
15-36 kg Type approval: E1 04301169
(UF)
L: Suitable for specific child seats. These child seats may be intended for use in a special car model, limited or semi-universal categories.
U: Suitable for universally approved child seats in this weight class.
UF: Suitable for front-facing universally approved child seats in this weight class.
01 Safety
Child safety
01
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