Arc like it name says, there can be one or more arcs in character.

Aperture is partially enclosed space. Always is open space.

Apex was part at the top where two strokes meets.

Vertex like apex but it is on bottom where two stroke meets.

Arm is horizontal or upward stroke who not connected to a stroke or steam on one side. Something on both end.

Ascender paces above x height of character and it is vertical stroke of lowercase letters.

Axis is imaginary line who places ftom top to bottom of leeter.

Break is sharp corner of some character.

Bilateral Serif placed from both side or single side of a main stoke, usually very short part.

Bowl on letter is the fully closed and rounded part of character.

Bracket job is to connect steam and serif, allmost always is curved.

Counter (open) like aperture but big area i character.

Counter (closed) like open counter and aperture but closed area in letter.

Crossbar is the horizontal stroke in some letters.

Crotch is angle of letter where two strokes meat but not meet corner.

Descender escape bellow baseline.

Eye like counter but not big, always is small closed area.

Finial is curved end.

Foot like it name sad, character standing on that foot.

Ear is tiny part of letter, usually in upper sides.

Hairline (stroke) most common for serif font and always is thiniest stoke in character.

Head Serif like the serif but always in top part of letter.

Juncture or Joint is point where two stroke meets each other.

Leg is always in bottom and is sloping stroke.

Ligature always is conection beetwen two or more letters.

Link or Neck is small stroke who connecting two part of letter.

Loop is always closed stroke in character.

Overhang is curves at the bottom of letters hang slightly below the baseline.

Serif is end of some strike, usualy on serif typeface.

Shoulder is curved stroke who start from steam and pointing downward.

Spine is the curving stroke from one direction to another.

Spur escaping from letter in small parts, usual for decoration.

Main Stroke or Stem exist for main part of character and other parts is attached to steam.

Stress showing transition between vertical horizontal and diagonal thick to thin transition.

Tail often is decorative. Extending from bottom to one side.

Tittle or Dot is a small dot usually above a letter.

Terminal don’t have serif and it it end of stroke on character.

Diagonal Stroke like it name says is diagonal stroke in character.

Ball Terminal is circle part of the end of terminal.

If you know more please contact us to add.