WHOLE CHARACTER
零líng
zero; odd; fragmentary; in small amounts; to wither and fall (of flowers and leaves)
零 is zero; it also marks leftover bits — small change, loose items, retail odds and ends.
ZDIC: 形声; the rain side carries the meaning, 令 the sound.
MEANING
雨yǔ
rain
Rain or falling-weather clue; also a standalone character.
In 零: meaning Shown with its documented or clearly limited role.
SOUND
令lìng
order; command
Standalone meaning is kept separate from its historical sound role in 冷 and 零.
In 零: sound Sound side per ZDIC: lìng and líng share the initial l and final ing; only the tone differs (4 vs 2).