þekkttum
Þekkttum is an Icelandic word that translates to "known" or "famous." It is the dative plural form of the adjective "þekktur," meaning known, recognized, or famous. In Icelandic grammar, the dative case is used for various grammatical functions, including indirect objects, the object of certain prepositions, and in idiomatic expressions. Therefore, "þekkttum" would appear in a sentence where "known" or "famous" refers to a group of people or things in a context requiring the dative plural.
For example, one might encounter "þekkttum söngvum" which would translate to "to known songs" or "among famous