1. Rock and Roll: This is the most common and widely recognized meaning. It's a symbol of rock and roll music, popularized by Ronnie James Dio, a heavy metal vocalist, in the 1970s. He adopted it from a gesture used by his Italian grandmother to ward off the evil eye.
2. Heavy Metal/Metalhead: The gesture is heavily associated with heavy metal music and its fans. It's often used as a greeting between metalheads and a symbol of their shared love for the genre.
3. Devil/Evil: Due to its resemblance to horns, the gesture is also associated with the devil or evil spirits. This interpretation is often used in a humorous or satirical context.
4. Number 2: In some cultures, particularly in Latin America, the gesture can be seen as a vulgar sign equivalent to the middle finger.
5. "C'mon!" or "Let's Go!": In some contexts, the gesture can be used to encourage someone, similar to cheering or clapping.
It's important to be aware of the context and intended meaning of the gesture before using it to avoid any misunderstandings.