Error notation (/erə(r) nəʊteɪʃən/) is used in linguistics to notate errors. The most common use is a leading asterisk to indicate an error, however other symbols are also used, though their usage is not universal.
|*||asterisk||Asserts that which follows was produced but is an error.||*"Shane more shorter than Bernie."|
|?||question mark||Indicates that the author is unsure whether that which follows is erroneous||?"There are less people in the class than before."|
|%||percentage sign||Indicates the author considers that which follows is grammatical only in a non-standard dialect.||%"If I wouldn't have gone running, I wouldn't have hurt myself."|
|#||hash||Indicates that which follows has semantic or pragmatic weirdness.||#"Colorless green ideas sleep furiously."|
These can be combined, e.g. #*"Colorless green ideas sleeps furious."