I see that Andrew has added a couple of marks on Dha blades to this thread, so here are a few more, also from Dha to add to the mix. These are all on Dha in my collection.
I can not throw any light on who or what they signify, except to say that the one which includes what looks like Burmese script, is in fact Mon script which is the language from which Burmese was derived. There are other symbals incorporated in this one also beside the script, and the round "hatched" mark also appears on this sword. The Chinese character mark is on a Dha from Yunnan.
Hope these are of interest.