Meditating on a name can be done by vibrating it as you would with a mantra or rune. It's to be felt in your soul first and then introspection occurs afterwards. You can think over how the vibration feels to you, what thoughts come to your head. What is the meaning of your feelings coming from vibrating the name.
The same type of focus can be done on a number. You start by focusing only on the number, (you can visualize it too), and feel the energy that comes from 'breathing in' that specific number. And then again, introspection on what the energy itself can mean or represent.
The symbol also is both feeling and visualization. Example being Satan's sigil, not only can it be felt upon visualizing and 'breathing it in,' the shape of the sigil itself has meaning, with a major concept of his sigil representing the union of the masculine and feminine energy. So for symbols, the shape of it would also have to be considered as your breathing in its energy.
And by now, meditating on text should make sense. Read the lines, and focus on the internal feelings it arises in you. Take your time on the energy and focus on the how these virtues not only uplift the soul, but they help it further ascend as well. Think of it like this, power meditations simply empower the soul in all its aspects, but the virtues GUIDE that same empowerment towards the Gods themselves..
So essentially, they guide the soul. They give light to its direction.
