twenty-six in fifty-two

sixth letter of the Latin alphabet, fourth consonant
phonetic name: "voiceless labiodental fricative" (fricare = Latin "to rub"); sound: put your top teeth on your bottom lip and blow
in Egyptian, the hieroglyph represented a horned snake
Proto-Sinaitic symbol "waw" was a drawing of a hook, nail or club (vertical stroke topped with a circle)
Phoenicians adopted the shape and opened the top circle - associated with a headrest, a phallus or oarlock
letterform adopted by Greeks into two letters: vowel upsilon (Y) pronounced "y", and consonant digamma (F) pronounced "w" (Greek gamma is shaped like this Γ ; digamma is 2 gammas piggybacked!) - note, sixth letter of the modern Greek alphabet is zeta, which breaks our tidy pattern (alpha, beta, gamma, delta, epsilon, ZETA!)
also, 'F' is the first consonant in the Latin alphabet that breaks the rhyming pattern ("aye bee see dee ee ... EFF!")
'F' historically is closely tied to letters U, V, W and Y
'F' is the first letter of the ancient runic alphabet of the Anglo-Saxons
in English, 'ph' is pronounced the same as 'f'
'f' becomes 'v' when pluralized (i.e. knife / knives)
"fee fi fo fum" is the first line o the classic English fairy tale Jack and the Beanstalk
some common 'f' word pairings: "first and foremost", "fight or flight", "friend or foe", etc.
lower case italic with a descender hook (ƒ) can be 1) florin sign, used in Dutch, Aruban and Netherlands currency, 2) a mathematical symbol for "function of", or 3) f-stop in photography (ratio between camera's focal point and its lens diameter)
'F' in music is the note 'fa', the fourth note in a C-major musical scale (and the only time letter matches the sound!)
'F hole' is the graceful f-shaped opening on a violin and other stringed instruments
the vowel 'a' sung in the musical note of 'F' stimulates the fourth chakra, located on the level of heart and lungs
associated with breath, danger and masculinity
Hebrew letter was also "waw", and indicates masculine gender; the Hebrew word "waw" means nail, ankle or hook - associated with pipe, canal, spinal column and phallus
as a sound, 'F' evokes breathiness of words (feather, fly, father)
in Roman, 'F' represents 40; also, Cicero believed letter 'F' was the "unsweetest" letter, and Quintilian thought 'F' to be "harsh and unpleasant...a sound scarcely human or even vocal"
'F' can stand for Latin fecit meaning "made it" and was often used by painters when signing their canvas
'F' represents temperature scale Fahrenheit (°F) named after German physicist Daniel Gabriel Fahrenheit (1686–1736)
"ff" or "fff" in music stands for "fortissimo" meaning "very strongly"
'F' is considered the fail / flunk in education
in formal typography, lower case 'f' is one of the most commonly ligated letters (ﬁ, ﬂ, ﬀ, ﬃ, ﬄ, etc.)
'F' in 'FM radio' stands for frequency modulation
'F' in chemistry is Fluorine (#9 on the periodic table), a pale yellow, corrosive gas, which reacts with practically all organic and inorganic substances. It is the most electronegative and reactive of all elements.
'F' in physics is farad, a unit that measures electrical capacitance
'F' in biology is phenylalanine, an amino acid
NATO phonetic alphabet: FOXTROT
in aircraft, commonly used to abbreviate "fighter" (ie. F-16, F-18)
until 1822, the letter 'F' was branded on people who fought the church ('F' stood for "fray-maker")
Vitamin F stood for Essential fatty acids until 1930, when it was agreed that they are better classified with the fats than with the vitamins. EFAs (omega-3 and omega-6) can be found in fish, flaxseed, hemp oil, soya oil, canola oil, chia seeds, pumpkin seeds, sunflower seeds, leafy vegetables, and walnuts.
"Fuck" is lovingly known as "the F word". "Fuck" is generally considered profane, most literally referring to the act of sexual intercourse. However, it may be used to negatively characterize anything that can be dismissed, disdained, defiled, or destroyed. It is due to the convergence of these two weighty concepts (sex and destruction) that the term can carry such overloaded emphasis, although it is frequently used as a mere intensifier. (Wikipedia)