Baseline

The invisible horizontal line upon which the main body of most Latin-script letters rests. The baseline is the fundamental reference line in a

Typeface vertical metrics:

X-Height,

Cap Height,

Ascender line, and

Descender line are all measured relative to it. Rounded or pointed letterforms (such as o and v) typically extend fractionally below the baseline — an optical compensation called overshoot — to appear visually aligned with flat-bottomed characters.