See also: Appendix:Variations of "da"
- Initialism of district attorney.
- Initialism of duck's arse (haircut).
- Initialism of Doctor of Arts.
- (Internet) Initialism of domain administration.
- Initialism of dairy association.
- (biochemistry) Initialism of dopamine.
- (anatomy) Initialism of descending aorta.
- (anatomy) Initialism of ductus arteriosus.
- (district attorney): ADA / A.D.A. / A. D. A. (assistant district attorney)
- (district attorney): EADA / E.A.D.A. / E. A. D. A. (executive assistant district attorney)