I wonder what the name of this part of a precompiler conditional is called? It is not visible enough for me.

If I select other themes, I seem not to find a suitable combination.

Aside: I program in XMOS XC, an real-time extension of C, so MSCode does this test wrongly. DO_DEBUG_PRINT_ADD_AND_SUB is indeed 3, defined in an included file.

Hard to tell from Theme Color