Symbols used to characterise a typical variable 'x' are shown below. The text equivalents also are employed since the symbols currently cannot be rendered conveniently in HTML.
| symbol | name | description | text |
|
|
| x-bar | steady or mean component | xm | |
|
| x-tilde | varying component; amplitude | xa | |
|
| x-hat | maximum value | xmax, xhi | |
|
| x-vee | minimum value | xmin, xlo |