Noun: Guarantee, warranty.
In our example sign are 3 compound nouns using takuu. Hintatakuu (”price guarantee”), tuoreustakuu (”freshness guarantee”) and laatutakuu (”quality guarantee”).
See takuu declined here.
Takuu is formed from the verb taata, which means “to guarantee,” by adding the suffix –uu to the verb stem to make it into a noun. Ending in -ata, taata is a type 4 verb and its stem needs to be changed from weak to strong grade in order to add a suffix, so the verb stem is tak–.