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The form of the letter F comes from Egyptian. It is the horned serpent hieroglyph I9. This desert dwelling snake is known in Egypt, and makes the sound, "fffff" when it hisses. This letter is grammatically key in Egyptian; it is a male possessive pronoun

The horned viper also refers to a legendary horned dragon in Egyptian and Sumerian cosmology, as shown in the image above. A horned serpent also figures prominently in Native American lore.

The Letter F:
FEATHER, FLIPPER, FIN

Feather, flight,
fish, flipper, and fin -
are words the letter F is in.
Flat things like
foliage and flower petals,
fern leaf, feet, and snow-flakes.

Things that diffuse,
fray and fork out,
fingers and fringes.