知 joins an arrow 矢 with a mouth 口: knowledge is speech that hits the mark — swift, direct, on target. To know is to be able to answer like an arrow flies.
知 is knowing itself: 知道 (to know — 'know the way'), 知识 (knowledge), 知己 ('one who knows me' — the soulmate-friend, rarer than gold in classical poetry). This app's Chinese name 知止 borrows Laozi: 知止不殆 — 'knowing when to stop, one avoids danger'. To know facts is 知道; to know when enough is enough is wisdom.
Answers that fly from the mouth 口 straight as arrows 矢 — to KNOW.
知己 'one-who-knows-me' — classical Chinese friendship's highest title. 人生得一知己足矣: one true knower in a lifetime is enough.