A distinguishing feature of a person or thing.
For a given field or ring, a natural number that is either the smallest positive number n such that n instances of the multiplicative identity (1) summed together yield the additive identity (0) or, if no such number exists, the number 0.
The integer part of a logarithm.
The distinguishing features of a navigational light on a lighthouse etc by which it can be identified (colour, pattern of flashes etc.).
Being a distinguishing feature of a person or thing.
Someone or something which selects or chooses.
An administrator responsible for selecting which players will play for a side.
A matching expression in a stylesheet determining which elements in the markup are affected by a style.
A text string transmitted to a Gopher server, identifying the resource to be retrieved.
A person who is entitled to choose a tract of Crown land to purchase.
A pointer to a structure describing a segment of memory.
A disc jockey.