Do la

རྡོ་བླ།

rdo bla is a nom de plume or pen name used by the 1st Drdrubchen for authorship, which was an abbreviation for Dodrub Lama. As I have not seen any of the other Dodrubchen's use this name, and his was again the only one I have seen use the name Dodrub Lama, I will at this point say it should always mean the 1st Dodrupchen Rinpoche Jigme Trinley Ozer when seen as the author's name within a given prayer or text.[BL]