Ten pairs of chopsticks are as strong as iron

It implies that unity is strength.

According to legend, there was an old man in ancient times who had ten sons. The sons were not united. In order to educate his sons, the old man called his sons to him, gave each of them a pair of chopsticks, and asked his son to break them, and then called others. Bring ten pairs of chopsticks and ask your sons to break them. No son can break these ten pairs of chopsticks.