Toyota prius Owner's Manual page 180

1-8. Safety information
Key of letters inserted in the above table:
U: Suitable for "universal" category child restraint system approved
for the use in this mass group.
UF: Suitable for forward-facing "universal" category child restraint
system approved for the use in this mass group.
X: Not suitable seat position for children in this mass group.
The child restraint system mentioned in the table may not be avail-
able outside of the EU area.
Other child restraint systems different from the systems mentioned in
the table can be used, but the suitability of the systems must be care-
fully checked with the child restraint system manufacturer and
retailer.
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PRIUS_OM_OM47871E_(EE)