A helmet, or protection for the head, might represent:
- A desire or need to keep your thoughts or feelings under wraps
- Protecting your sense of identity, beliefs, or other mental or emotional aspects of yourself from others or from outside influences
- A fear of or lack of desire for making your thoughts, feelings, identity, or other aspects of yourself known to others
- The idea of protecting yourself from mental, emotional, or psychic attack
- A desire to protect whatever a "head" represents to you