In typography, the portion of some lowercase letters that extends above the character's x-height. The ascending characters are b, d, f, h, k, l, and t. They may not always align at the top of the ascender, although most do. One must be careful that line spacing, or leading, is sufficient so that the ascenders of one line do not touch the descenders of the previous line. In Old Roman typefaces, the ascenders were taller than capital letters. See also Descender and x-Height.