• f0,
• fo4 ay or aye,
• fo2 fair,
• fo free,
• f9,
• fo5 free,
• fo nnap,
• f o,
• fo ur-way,
• fo9,
• f0o,
• fo4 every,
• fo ra,
• fo2 free,
• fo rayer,
• fo2 war,
• fo ura,
• fo re,
• fvo,
• fo away with,
• fo4 free,
• f9o,
• fo ray,
• fo ofooraw,
• fo rehear,
• fo far,
• fo urier,
• fo air,
• fo fore,
• fo hurry,
• fo over,
• vfo,
• fo yer,
• fo r ay or aye

Fo is an ancient Chinese wind instrument whose exact origin remains unknown. It consists of a set of long, thin wooden tubes, each one tuned to a different pitch. The player blows down one end while simultaneously manipulating the other ends with his or her fingers. Basically, the farther along the tube the player's fingers go, the higher the tone of the sound produced. An interesting quality of fo is that it is capable of producing what are known as 'subtones', or notes that are between the different intervals of the chromatic scale.

• FOO,
• F,
• foye,
• foe,
• Foy.