A unique number which identifies a published book, for example, an ISBN.

(grammar) A numeral that expresses how many times some event happens.

plural of numbered list

A number assigned to each work composed by Wolfgang Amadeus Mozart.

(fluid mechanics) A dimensionless number (symbol We) that is useful in analysing fluid flows where there is an interface between two different fluids. It can be thought of as a measure of the relative importance of the fluid's inertia compared to its surface tension.

plural of Carol number

(genetics) The number of chromosomes in each cell of an organism

plural of cake number

(mathematics) For some number n, the maximum number of regions into which a cube can be partitioned by exactly n planes.

plural of angel number