fi
/ˈfi/ · B2 · noun · f
phi
Spanish fi = Greek letter phi (Φ/φ), said 'fee' like English 'fee'
Spanish 'fi' is the name of the Greek letter phi, which stands for the golden ratio. It is spelled as it sounds: 'fi' rhymes with 'see' and 'fee', so think of paying a fee to learn the golden ratio.