Could-you-please-explain-the-concept-for-how-to-use-triple-tick-and-backslash-in-system-verilog-macrosifdef

UVM ,  Could-you-please-explain-the-concept-for-how-to-use-triple-tick-and-backslash-in-system-verilog-macrosifdef ,  defines ,  etc ,  macros-and-defines