Today's Hanzi is one you will rarely write and is mostly used verbally.
It is 叫 (pronounced jiào) and that means "to be called". The basic use is for presenting yourself (your first name only, there is another word for the surname).
ex: 我叫玛丽 （Wǒ jiào mǎlì）translates literally "I am called Mary"/"My name is Mary".
To remember the Hanzi, just imagine the left square as a big open mouth (remember ...) and the right kind of 4 as a hand placed next to the mouth.
From there you can easily imagine someone calling someone else.