What does o over PhD LLD MD mean?

There's no standard or widely recognized meaning for "o over PhD LLD MD". It's likely a typo, a misunderstanding, or a non-standard abbreviation. The letters individually represent:

* PhD: Doctor of Philosophy

* LLD: Doctor of Laws

* MD: Doctor of Medicine

The "o" has no known academic or professional designation in this context. Without more information about where you encountered this abbreviation, it's impossible to say for sure what it means.