PRONOUNCE S/S22 - ◯

You can’t get a perfect circle without the use of compasses and rulers. (One can’t achieve greatness without following rules and laws.)
“方圆” ( fāng yuán), square and circle, are used together as a noun, indicating “proper achievements”. This is also how the term “规矩” ( guī jǔ, compasses and rulers) became the noun for rules, regulations and laws in modern Chinese.   - 没有规矩，不成方圆 ( méi yǒu guī jǔ, bù chéng fāng yuán )