T (Thumb)
The T stands for Thumb instruction set which addresses the issue of code density. Specifically, Thumb mode allows instructions to be 16-bits instead of 32-bits thus reducing code density. A processor having the T suffix can thus run Thumb code.
D (Debug)
The D stand for debug support. This means that the specific ARM7 you are using offers on-chip debug support, generally through a J-Tag interface.
M (Multiplier)
The M means that the CPU contains a hardware multiply instruction.
I (Embedded ICE Macrocell)
Is the debug hardware built into the processor that allows breakpoints and watchpoints to be set.
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