These little guys remind me of 'The Infernal Devices' by Cassandra Clare. A new Clockwork Army! (Yes, I'm a nerd) (Cool tiny mechanical insects made of old watch and radio parts by Justin Gershenson-Gates.
If you’re quite familiar with the symbol below, it could be the Deathly Hallows symbol from Harry Potter. If you know that, then I’m assuming you also know that a deer has so much value for a couple of characters in the story.