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.

Which, what position (in an ordered series, such as which day of the month or which floor). (This entry is a translation hub.)

(computing) The sequential number indicating a particular line of text in a text file.

A suggested cognitive limit to the number of people with whom one can maintain stable social relationships. It has been proposed to lie between 100 and 250, with a commonly used value of 150.

The number, on a bib, that is used to identify entrants in a race

A telephone number that someone can be contacted on. / (geometry) Synonym of kissing number

(dated) telephone number

(mathematics) The nth taxicab number, typically denoted Ta(n) or Taxicab(n), is the smallest number that can be expressed as a sum of two positive algebraic cubes in n distinct ways.

(mathematics) A composite number n that satisfies the modular arithmetic congruence relation bⁿ⁻¹≡1(mod n) for all integers 1<b<n that are relatively prime to n.

(mathematics) A squarefree positive integer d such that the imaginary quadratic field Q(√(−d)) has class number 1; equivalently, such that its ring of integers has unique factorization.