Related Words

Big Four: The 4-6-7-10 split, see also Big Ears.

Foursome: 1. Four players playing together in a group 2. A match in which two 2-person teams compete against each other with each side only playing one ball (more on tournament formats and games)

Fourier Transform (2D): mathematical representation of an image as a series of two-dimensional sine waves. The smaller the wavelength, the higher the spatial frequency, the higher the resolution of features in the . . . View Full Definition

Fourth: The interval between two notes. Two whole tones and one semitone make up the distance between the two notes.

Fourth Arrow: The 20th board from the right (right handed player).

Fourth Down: The final of a set of four downs. Unless a first down is achieved or a penalty forces a replay of the down, the team will lose control of the ball after this play. If a team does not think t . . . View Full Definition

Fourier Space: the argument space of the Fourier transform, spanned by the components of the spatial frequency vector.

Fourier Shell Correlation (FSC): same as Fourier ring correlation, except that values of the discrete Fourier transforms are compared within corresponding shells, instead of rings [van Heel, 1987b.

Four-Point Stance: A down lineman's stance with four points on the ground, in other words, his two feet and his two hands often a technique used in short yardage or goal line situations.

Four-Hand Piano Music: Chamber music genre for two performers playing at one or occasionally two pianos, allowing home or salon performances of orchestral arrangements.