The trident (Trisula) symbolizes the three gunas:
Sattva - lucidity and balance, Rajas - dynamism and Tamas - darkness and delusion.
The Hindu Trinity Brahma, Vishnu and Shiva and their qualities: creation, preservation and destruction.
The three planes of reality: physical, subtle, and causal.
And the three ordinary states of consciousness: waking, dreaming and deep sleep.
The Cobra represents fertility, spirituality and the Kundalini.
The Amethyst effects sobering, clearing and concentration.