What Is The Symbol That Represents DDD? I Suffer With

What is the Symbol that represents DDD? I suffer with this daily. My daddy had it really bad.. I don't want to go that route at all. I get pain management injections. Waiting to see if they are worth it. Will injections slow the process? I also have pain medication I'm trying not to take;, as little as possible. Should I put this on a Medical Alert Tag? Thank you.