In the name of the London exchange LIFFE, what do the two F's stand for?

The London International Financial Futures and Options Exchange (LIFFE, pronounced 'life') is a futures exchange based in London.

The London International Financial Futures Exchange (LIFFE), established by Sir Brian Williamson started life on 30 September 1982, to take advantage of the removal of currency controls in the UK in 1979. The exchange modelled itself after the Chicago Board of Trade and the Chicago Mercantile Exchange. It initially offered futures contracts and options linked to short-term interest rates. In 1993 LIFFE merged with the London Traded Options Market (LTOM), adding equity options to its product range. This is when it changed its name to the London International Financial Futures and Options Exchange.

LIFFE is now part of Intercontinental Exchange group following a series of takeovers. Euronext acquired LIFFE in 2002, and were then in turn taken over by NYSE in 2007, to form NYSE Euronext. The main rationale for this transaction was to gain ownership of LIFFE. In the same manner, Intercontinental Exchange then purchased NYSE Euronext in 2013, principally to acquire LIFFE. Euronext then completed an IPO in 2014, but LIFFE remained in the portfolio of the ICE NYSE group under the name ICE Futures Europe.