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.
Symmetry named by axis order and plane letter.
Also known as: HM symbol, Space group naming system
The international notation for crystallographic point and space groups, naming symmetry elements by axis order and plane letter in a fixed order of directions.
Names a crystallographic point or space group by listing its symmetry elements in a fixed order of crystallographic directions.
Contexts: Laboratory
Encodes direction by position, so the same numeral means a different axis depending on where in the symbol it stands, which is what makes the notation compact and what makes it hard to read at first.
Contexts: Laboratory
A short string of figures and letters such as a numeral over the letter m, read left to right as a sequence of directions.