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.
A point of resemblance; a similarity.
The state of being conforming, of complying with a set of rules, with a norm or standard.
The state of things being similar or identical.
The ideology of adhering to one standard or social uniformity.