Counter

The enclosed or partially enclosed white space within a letterform. Counters are classified as closed (fully enclosed by
Stroke
, as in o, d, and b) or open (partially bounded, as in c, s, and the upper portion of e). Counter size and shape are major determinants of a
Typeface
apparent openness,
Legibility
, and texture — larger, more open counters generally improve
Readability
at small sizes, while tighter counters produce a denser, more compact
Typographic Color
on the page.