Is the "Sign of the Horns" a manifestation or an act of 'Avodah Zarah? What if someone uses the gesture as a pop culture reference (eg., heavy metal), or just jokingly - or even mockingly about either that culture or even mocking 'Avodah Zarah?
If it's an act of 'Avodah Zarah to use it even in the most casually associated case above (some form of dark-themed heavy metal, eg.), does that make the sign itself inherently 'Avodah Zarah, or can it be used for other purposes (cf. ibid - #Sports)?