necessary; essential; indispensable; required
必 · 5 strokes
Pictograph of a weapon handle, now written as 柲. 八 was later added as a decorative mark. Similar to 戈 but without the blade. The current meaning is a phonetic loan.
要 · 9 strokes
Pictograph of two hands grabbing a woman's (女) waist. The current meaning "want" is a phonetic loan. The original meaning "waist" is now written as 腰.