U can create ur own sigil for anything. Write down what u want. Example. Banish all negative forces around me. Use a letter in each word. banfam. That's it! Remember the power is not the sigil the power is u.
Ankh: It is by Egyptologists called the symbol of life. It is also called the "handled cross", or crux ansata. It represents the male triad and the female unit, under a decent form. There are few symbols more commonly met with in Egyptian art. In some sculptures, where the sun's rays are represented as terminating in hands, the offerings which these bring are many a crux ansata, emblematic of the truth that a fruitful union is a gift from the deity.
Onyx: Black Onyx is a popular and powerful gemstone. The keywords behind Black Onyx meaning are Intuition, Rejuvenation, Divination, Strength, Change, Balance, Grounding, Focus, Self Confidence, Banishing Negativity, Protection, Letting Go, Decreased Sexual Desires