Zodiac sign charms designed by design letters. a unique piece of design jewellery with a strong graphic look and beautiful details in enamel. zodiac by design letters® is available in 12 unique designs based on the 12 zodiac signs. each zodiac sign has a word engraved on the backside which characterize the particular zodiac sign. combine the zodiac sign with your personal letter charm from design letters and/or a star charm to emphasize the focus on your specific zodiac sign.