We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
A group name inside vertical bars, counting its elements.
Also known as: Order of a group, Group cardinality, Bars around a group
Vertical bars around a group give its order — how many elements it has. The same bars mean absolute value around a number, cardinality around a set and determinant around a matrix, so the bars themselves say nothing; what is inside them decides.
Denotes the order of a group: the number of its elements, or infinity.
Contexts: Mathematics
Uses the same paired vertical strokes as absolute value, set cardinality and matrix determinant; the four are told apart only by what they enclose.
Contexts: Mathematics
Two upright parallel strokes of equal height with a letter set between them.