The asterisk has a different meaning in grammar and in historical linguistics.
1. In grammar, the asterisk means a construction that is impossible according to the rules of the language:
- *He are a nice boy.
- *You spoken a mouthful.
- *I see pink cat.
2. In historical linguistics, the asterisk means a form that is postulated, but for which we have no written evidence.
- The French past participle vendu is derived from a non-Classical Latin form *vendútum.