MHDOC was a defensive registration I made in the early days of the internet to “protect” my primary income generating domain Mobile Home Doctor. This was never really necessary so the domain has remained mostly inactive.
I toyed with the idea of moving from Mobile Home Doctor to MHdoc, but by the time I thought about it, MHD was firmly established in the organic search results and it wasn’t worth the SEO risk of changing domains.
Perhaps a doctor with a specialty which has the initials “MH” might see value in a nice five letter dot com domain?
MHdoc.com was first registered in 2001.