Could you please double-check the prefix you're referring to? Perhaps you meant:
* "Fri-" as in "Friday": This refers to the sixth day of the week, named after the Norse goddess Frigg.
* "Fri-" as a shortened form of "friend": This is a common informal abbreviation used in online communication.
Please provide more context or clarify the word you're asking about, and I'll be happy to help you understand its meaning.