What are symbols for balance?

ying and yang?

I believe it is yin and yang. That's why you got a red squiggle under "ying."

(New Edit) Yes, yin snd yang are the most well known symbol for balance. The circles of opposite color in each side represent the balance, how one as a bit of the other and vice versa. Yin is often associated with females and yang with males. Hope this helped!