Arm: The stroke that stretches away from the letterform.

Ascender: The vertical strokes of a letterform that rise from the main body or x-height. Can be taller than the cap height.

Baseline: The horizontal line that the letters rest upon (rounded forms and descenders can cut below for visual balance).

Bowl: The rounded shape of a letterform.

Cap Height: The vertical measurement of the capital letters. Varies from typeface to typeface.

Counter: The interior space inside a letter. From the old type foundry's process of counter punching the metal or wooden type blocks.

Cross Bar: The linking horizontal stroke of a letterform.

Descender: The vertical strokes of a letterform that drop from the main body or x-height.

Leg: The diagonal stroke of a letterform.

Serif: The small strokes found along the tops, or ends of letter forms.

Terminal: The end stroke of a letter form. Vertical versus angled terminals can help define closely resembled typefaces.

x-Height: The vertical measurement of the lowercase letters. Varies from typeface to typeface.