Help with making a sigil?

I've been doing some research into sigils and I want to make my own, but I was wondering if all sigils have to incorporate letters into them? I know you have to start out with an intention, but can you not just doodle while thinking about that intention and charging the sigil with it? I'm kinda new to all... show more I've been doing some research into sigils and I want to make my own, but I was wondering if all sigils have to incorporate letters into them? I know you have to start out with an intention, but can you not just doodle while thinking about that intention and charging the sigil with it? I'm kinda new to all this stuff... some websites I've looked at normally go from writing down your intention to taking out vowels and double letters without any clarification on whether you can or cannot remove letters completely from the sigil.
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