STEM: The stem is the main, usually vertical stroke of a type character. It also known as "stroke". The vertical, non-curved portions of L, l, d, B, and p are examples of stems. H, N, and M have two stems each. Some letterforms such as y and A may have a sloped or diagonal stem.
CROSSBAR: The horizontal stroke across the middle of a type character is called crossbar. It also known as bar, arm and cross stroke. The cross bar connects the diagonal strokes of an uppercase A or the vertical stems of an H. In contrast, the cross stroke intersects the stem of a lowercase t or f while the arms of an uppercase F connect to the stem only at one end.
ARM: The arm of a letter is the horizontal stroke on some characters that does not connect to a stroke or stem at one or both ends. The top of the capital T and the horizontal strokes of the F and E are examples of arms. The arms of an uppercase F connect to the stem only at one end and the arm of an uppercase T sits at the top of the stem and doesn't connect at either end.
EXTENDER: An extender is that part of a letter that extends above the x-height or below the baseline. An ascender and a descender are extenders.
TAIL: The descending, often decorative stroke on the letter Q or the descending, often curved diagonal stroke on K or R is the tail.
BOWL: The curved part of the character that encloses the circular or curved parts of some letters such as d, b, o, D, and B is the bowl. Some sources call any parts of a letter enclosing a space a bowl, including both parts of a double-storey g and the straight stem on a D or B.
EYE: The eye refers specifically to the enclosed space in a lowercase e. It also known as counter.
EAR: Typically found on the lower case g, an ear is a decorative flourish usually on the upper right side of the bowl. Similar to a serif, the ear can be a distinctive, identifying element of some typefaces.
SPUR: Similar to but generally smaller than a serif or beak, a spur is a small bit at the end of certain curved portions of a character such as the end(s) of a C or S or the middle of G. It also known as barb, cat's ear.
BEAK: A beak is a type of decorative stroke at the end of the arm of a letter, connected to the arm by the terminal. Similar to a spur or serif, it is usually more pronounced.
Other parts of typefaces are shown below: