Antimony is a chemical element with the symbol Sb (Latin: stibium, meaning "mark") and atomic number 51. A metalloid, antimony has four allotropic forms. The stable form of antimony is a blue-white metalloid. Yellow and black antimony are unstable non-metals. Antimony is used in flame-proofing, paints, ceramics, enamels, a wide variety of alloys, electronics, and rubber. In the comic, it is also the first name of the main character, Antimony Carver.
The alchemical symbol for the metal element antimony is . This may be a source for the Antimony ("Annie") character's symbol created by inverting and combining with the symbol for quicklime (). Annie's symbol appears in the comic at the bottom right corner to indicate the end of each chapter and on Reynardine's forehead after he possessed her plush wolf to indicate she now controls him. The necklace that Surma gave her daughter Annie also bears this symbol as a pendant.
According to What's Your Sign, "this elemental alchemy symbol represents animal tendencies found in humankind – a wild nature in all of us – wear this symbol when you are feeling meek – it will remind you of the animal power that dwells within you." Thus it is a symbol of protection.
The Russian word for Antimony is Sur'ma, which happens to be the name of Antimony's mother. Her last name, Stibnite, is the name of the primary mineral from which antimony is extracted.