FI or fi may refer to:
Finland (Finnish: Suomi [suo̯mi] ( listen); Swedish: Finland [ˈfɪnland]), officially the Republic of Finland (Finnish: Suomen tasavalta, Swedish: Republiken Finland) is a country in Northern Europe bordering the Baltic Sea, Gulf of Bothnia, and Gulf of Finland, between Norway to the north, Sweden to the northwest, and Russia to the east.
Fiji ( ( listen) FEE-jee; Fijian: Viti [ˈβitʃi]; Fiji Hindi: फ़िजी), officially the Republic of Fiji (Fijian: Matanitu Tugalala o Viti; Fiji Hindi: फ़िजी गणराज्य), is an island country in Oceania in the South Pacific Ocean about 1,100 nautical miles (2,000 km; 1,300 mi) northeast of New Zealand's North Island.
Mozilla Firefox (or simply Firefox) is a free and open-source web browser developed by Mozilla Foundation and its subsidiary, Mozilla Corporation.
In mathematics, the Fibonacci numbers are the numbers in the following integer sequence, called the Fibonacci sequence, and characterized by the fact that every number after the first two is the sum of the two preceding ones:
A film, also called a movie, motion picture, moving picture, theatrical film, or photoplay, is a series of still images that, when shown on a screen, create the illusion of moving images.
Fish are gill-bearing aquatic craniate animals that lack limbs with digits. They form a sister group to the tunicates, together forming the olfactores.
Firefly is an American space Western drama television series which ran from 2002–2003, created by writer and director Joss Whedon, under his Mutant Enemy Productions label.