* It's a typo or misspelling: Perhaps it's meant to be another abbreviation, like DBA (Doctor of Business Administration), PhD (Doctor of Philosophy), or EdD (Doctor of Education). Double-check the source where you saw this abbreviation.
* It's a non-accredited or proprietary program: Some institutions offer doctoral degrees that aren't accredited by recognized bodies. These degrees may use less common abbreviations and might not hold the same weight as those from accredited universities.
* It's a specific program at a particular institution: A very small number of universities *might* use a non-standard abbreviation internally. If you encountered this abbreviation in a specific context (like a university's website), providing that context would help determine its meaning.
To accurately understand what the "DA" doctoral degree represents, you'll need to provide more information about the source where you saw it.