(a.) Having three angles, or corners; triangular; as, a trigonal stem, one having tree prominent longitudinal angles.

arrowhead character cuneate cuneated deltoid demotic character determinative grammalogue hieratic symbol hieroglyph hieroglyphic hieroglyphics hiragana ideogram ideograph kana katakana logogram logograph ogham oxygonal phonetic phonetic symbol pictogram pictograph radical rune shorthand triangular trigonal trilateral wedge word letter