(typography) A space which has a nominal width of 1 em.

(typography) A space which has a nominal width of 1 en

(topology) A topological space in which for any two distinct points x and y, there is a pair of disjoint open sets U and V such that x∈U and y∈V.

(letterpress typography) A metal block used to separate words, one third of an em in width. / (typography) In digital text, a character representing a thick space.

(letterpress typography) A metal block used to separate words, one fifth of an em in width. / (typography) In digital text, a character representing a thin space.

(topology) A separable, completely metrizable topological space

Alternative spelling of breathing space

(topology) A space obtained from another by identification of points that are equivalent to one another in some equivalence relation.

(topology, idiomatic) A space obtained from another by identification of points that are equivalent to one another in some equivalence relation.

(topology) A topological space such that any open cover of the space has a countable subcover.