WHOLE CHARACTER
知zhī, zhì
to know; to realize (知道, 知觉); knowledge (知识); to inform (通知); a close friend (知音, 相知)
知 is to know — knowledge, notices, and the friend who understands you.
ZDIC: 会意, 从口、从矢 — named pieces without further explanation in the extracted entry.
ARROW PIECE (THE RADICAL 矢)
矢shǐ
arrow
Standalone meaning is kept separate from its named role in 医.
In 知: arrow piece (the radical 矢) The arrow piece; ZDIC names it without further explanation.
MOUTH PIECE
口kǒu
mouth; opening
Mouth/speech/opening clue; may also be a repeated visual element.
In 知: mouth piece Shown with its documented or clearly limited role.