One way to identify a Jewish home is to see a mezuzah affixed to a doorpost, which is shown here in the abstract: this cartouche represents a doorpost, and the two sets of three bumps on the left side of the piece represent the hinges on the inside of the door. The rectangle of negative space represents the mezuzah that would be affixed to that doorpost, leaning in towards the home in the top third of the doorpoost as it would traditionally be positioned. There is a certain redundancy to be found in a mezuzah pendant that shows an image of a doorpost mezuzah, but that makes this design that much more interesting.
Dimensions: 0.3" x 1"
Chain is included