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.