athame vs brass knuckles

athame

noun
  • A ceremonial pointed knife or dagger, used especially in Wicca and other neopagan traditions and typically having a black handle with magical symbols on it. 

brass knuckles

noun
  • A weapon consisting of a metal reinforcement for the clenched fist, with finger holes molded in. 

How often have the words athame and brass knuckles occurred in a corpus of books? (source: Google Ngram Viewer )