I don't know that he has any place in the aes sedai symbol, but was thinking that in the wheel of time symbol he would be trapped in the center of the wheel, which brings up an interesting thought: Does the wheel use his energy to power itself as well as saidin/saidar. It could very well be that as the DO struggles against his imprisonment, he unwittingly serves into its purpose.

Imagine the DO as a big angry axle that has no choice but spin even though he hates being so dizzy....