Fluorine.

Liczba mnoga: Fs

The sixth letter of the English alphabet. Its capital form has changed little from that of the earlier Semitic alphabets. The sound f is an unvoiced lip-biting fricative.
In music, abbreviation for forte (loud).

Liczba mnoga: F clefs

Bass clef.

Liczba mnoga: F connectors

A coaxial connector, used primarily in video applications, that requires a screw-on attachment. See the illustration.

Liczba mnoga: F distributions

A probability density function that is used especially in analysis of variance and is a function of the ratio of two independent random variables each of which has a chi-square distribution and is divided by its number of degrees of freedom.

Singular of F keys is F key.

See function key.

Liczba mnoga: F layers

The highest and most densely ionized regular layer of the ionosphere occurring at night within the F region

Liczba mnoga: F regions

The highest region of the ionosphere occurring from 80 miles (130 kilometers) to more than 300 miles (500 kilometers)

British flying-boats developed by the Felixstowe experimental seaplane station of the Royal Naval Air Service in World War I. They were used for antisubmarine patrolling in the waters around the UK.

Liczba mnoga: F-Key assignments

Liczba mnoga: F-Key designations

Liczba mnoga: F-Key rows

Liczba mnoga: f-numbers

Or f-stop measure of the relative aperture of a telescope or camera lens; it indicates the light-gathering power of the lens. In photography, each successive f-number represents a halving of exposure speed.

Liczba mnoga: f-stops

In photography, one of a series of numbers on the lens barrel designating the size of the variable aperture; it stands for the focal length and follows an internationally accepted scale.