wú
从无到有
cóng wú dào yǒu
From nothing to something.
无产阶级丨无家可归
wúchǎn jiējí | wú jiā kě guī
Proletariat | Homeless.
有则改之，无则加勉。
yǒu zé gǎi zhī, wú zé jiā miǎn
If there are faults, correct them; if there are none, encourage yourself to do better.