The term "fr" could be a typo or an abbreviation. If we consider that it might refer to "for", this word denotes a purpose or intention behind an action or decision. It indicates the reason something is done or the recipient of something.
If "fr" refers to "French" in some contexts, it relates to the language spoken primarily in France and several other countries.
If we consider "for," it comes from Old English "for," which means "before" or "instead of." It has Germanic roots and has evolved in its meaning over time.
If my assumption about the word "fr" is incorrect, please provide further details.