Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
Lowercase. Hyphenate.
On the first mention, use category (x) axis to refer to the horizontal axis in charts and graphs that shows the categories being compared. On subsequent mentions, use x-axis. It's OK to use horizontal (x) axis in content for a general audience.
Don't use italic formatting for the x in x-axis unless the entire word is italic.
See also value axis, category axis