Reprint: R1207B. Executives complain, with justification, that meddling and second-guessing from shareholders are making it ever harder for them to do their jobs effectively. Shareholders complain, with justification, of executives who pocket staggering paychecks while delivering mediocre results.
The underscore [ _ ] (also called understrike, underbar, or underline) is a character that originally appeared on the typewriter and was primarily used to underline words.
These are all part of the language, and, as such, can be found in any text that properly describe the language, such as Scala Specification(PDF) itself. The last one, the underscore, deserve a special description, because it is widely used, and has different meanings depending on the context.