RTDd

I’m not able to locate a widely recognized subject exactly named “RTDd.” To write a reliable, neutral wiki-style article under 300 words, I’d need a bit more context. Could you provide what RTDd stands for or the field it relates to (for example, science, technology, an organization, a standard, etc.)? If you share the full form or a brief description, I can draft a concise, properly sourced article accordingly.