The portion of a lowercase letter that extends above the X-Height line. Examples include b, d, f, h, k, and l. The imaginary line marking the top of the tallest ascender is called the ascender line. Ascender length relative to x-height significantly affects the vertical rhythm and openness of a Typeface: longer ascenders create a lighter, more elegant texture, while shorter ascenders (paired with a large x-height) improve compactness and small-size Legibility.