rhetorical device; stylistic device
Technical term used in rhetoric, literary analysis, and composition to refer to techniques such as metaphor, simile, hyperbole, etc.
Metaphor is one of the rhetorical devices.
Many rhetorical devices are used in this text.
Compound of 修辞 (rhetoric) and 技法 (technique). The exact historical derivation is uncertain, but the term is a modern technical coinage.