What is a Brahman symbol look like?

1. Brahman can't be represented by any symbol or object in the real world.

This is because Brahman is the very junction of our real and imaginary worlds.

2. Brahman is our entire ideal life in a condensed form. It is indivisible. A symbol enables us to do something under a set of very few conditions and thus simplifies life. Since Brahman is indivisible it can't be represented symbolically.