17238989_Intel__Debugger__IDB__Manual__Meaning
[Convention] monospaced italic text [Meaning] 
Monospaced italic type indicates variable values, place holders, and function argument names. In syntax definitions, monospaced italic text indicates non-terminal names. When a non-terminal name consists of more than one word, the words are joined using the underscore (_), for example, breakpoint_command.
Intel® Debugger (IDB) Manual
Meaning