It's not commonly used in modern German, but you might encounter it in old literature or poetry.
Here are some examples:
* "Mein Herze schlägt für dich" (My heart beats for you) - This sentence is grammatically correct but sounds quite old-fashioned.
* "Du bist mein Herze" (You are my heart) - This is another poetic way of saying "You are my love".
If you're trying to understand modern German, you'll likely only encounter the word "Herz".