n-message

A message singling out one thing from a set of \(n\) is sometimes called an \(n\)-message. For example, a message singling out one thing from a set of 13 is a 13-message. An \(n\)-message carries \(\log_2(n)\) bits of information. For a formal account of what it means for a message to “single out one thing from a set of \(n\),” see Information.