Can't speak specifically for the 737 but FWIW on the 777 and 747 "D-TO" was the correct annunciation when you were performing an assumed temperature take-off.
TO 1 or TO 2 was seen on the 744 when you performing a Reduced Thrust Take-off, something we'd (generally) only get involved with if performing a three engined ferry.
In any event surely the answer should all be in the appropriate FCOM 2.
( slow in typing - what Denti said!!)