It is literally the number 4, and shows up on all the other shekels from 4th year of the revolt. Often there is a W looking character connected to it. Scroll to

It is literally the number 4, and shows up on all the other shekels from 4th year of the revolt. Often there is a W looking character connected to it. Scroll to "First Revolt shekel, Year 4" on this page: https://www.amuseum.org/book/page14.html https://www.amuseum.org/book/page14.html to see three of them (including one similar to the one in the article). One of the coins in the final set on the page also show it. If you look closely, you can see that they stamped the new coin image over top an older one. You can see the shape of the head, and just about make out the face. They hint to that, and why it is, in the article. Incidentally some people might think your comment is anti-Semitic.