the.com/letterform

means The distinct visual shape of a letter — the specific contours and strokes that make it readable as that letter in a given typeface.

from A straightforward compound of 'letter' (from Latin 'littera', a written character) and 'form' (from Latin 'forma', shape). It's a 20th-century typography and calligraphy term, coined when designers needed a precise word for the visual anatomy of a character — its strokes, curves, and counters — separate from the letter as an abstract idea.