Prescriptivism
The non-cognativist metaethical theory that holds moral sentences are not properly considered statements or containing
propositional content,
but rather imperatives or commands to act, or refrain from acting, in certain ways. On this view, any moral sentence
(e.g., “it’s wrong to lie”) could be more clearly articulated as an imperative (e.g., “don’t lie”).
See 'Metaethics'.