Fimbul is an Old Norse word often used as a prefix for "giant" or "mighty", which is found in:
Fimbulwinter (), a heavy winter that preludes the events of Ragnarök Volcanic winter of 536, a 6th century volcanic winter in Europe, in modern Swedish often called "Fimbulwinter"
Geography Fimbul Glacier, Greenland Fimbul Ice Shelf, Antarctica Fimbulheimen, Antarctica Fimbulisen, Svalbard