Revolvers are easy:
DAO = Double Action Only
SAO = Single Action Only
DA/SA = both
Our standard military pistols still fit the revolver definitions:
M1911 = SAO
M9 = DA/SA
Some newer automatic pistols still meet the old definitions too:
Taurus 24/7 also meets the DAO definition
Taurus 845 meets the DA/SA definition
XD/XDm meets the SAO definition
What doesn't work is the pre-set hammers and strikers. The ruger LCP is a pre-set hammer and the Glock is a pre-set striker. They are not DA, nor SA nor DA/SA. If you have a misfire on the pre-set trigger, they are not DA to just fully recock again.
What do you like better for a new acronym these pre-set strikers and pre-set hammers?