(mathematics, obsolete) A fraction.

(mathematics) A number consisting of a whole number and a fraction, such as 11½.

(geometry, topology, mathematical analysis) The total number of times a given curve travels counterclockwise around a specified point.

(chronology) A number showing the year of the lunar or Metonic cycle. It is reckoned from 1 to 19, and is so called from having formerly been written in the calendar in gold.

A ratio used in fluid dynamics to define a concentration profile of suspended sediment and which determines how sediment will be transported in a flowing fluid.

(roguelikes, humorous) The pseudorandom number generator used by a roguelike game's engine.

(Britain) Either of a pair of rectangular metal plates bearing an alphanumeric code, fixed to the front and rear of a motor car to show its identity as registered with the DVLA.

(graph theory) The number of edges in a minimum edge cover of a graph, often denoted as 𝜌=𝜌(G).

(graph theory) the number of vertices in a maximum independent set of a given graph, often denoted as 𝛼=𝛼(G)

(graph theory) the number of edges in a maximum matching, often denoted 𝜈=𝜈(G)