昨天

Why does 昨天 look like this?

This word is made of two characters: 昨 (zuó) + 天 (tiān). \n\n1. 昨: The radical is '日' (sun/day) on the left, paired with '乍' (suddenly) on the right. It refers to time that has passed.\n2. 天: Originally a picture of a large person (大) with a mark over their head to represent the 'sky' or a 'day'. \n\nTogether, 'past-day' means yesterday!