A signature spell (or signature move) is the spell most commonly cast by a witch or wizard, especially when used in the context of duelling. Even though the spell may be the one the caster is best at, its predictability can make its user vulnerable.
The Killing Curse was thought by most of the wizarding world to be Voldemort's signature spell, and Sectumsempra was seen by those who knew of it to be the signature move of its inventor, Severus Snape.
Behind the scenes
- The Full Body-Bind Curse seems to be the signature move of most if not all Pottermore users, as it is the most popular out of all; Furnunculus is the least popular.
- Harry Potter and the Deathly Hallows (First appearance) (Mentioned only)