General terms:
* Repetition: This is the most common and neutral term.
* Iteration: This word emphasizes the act of repeating something multiple times.
* Refrain: This is often used in music or poetry to describe a phrase that is repeated throughout the piece.
* Chorus: Similar to refrain, but specifically used in music for a repeated section.
More specific terms:
* Riff: This word is used in music to describe a short, repeated musical phrase.
* Hook: A catchy phrase that is repeated in a song, designed to get stuck in the listener's head.
* Slogan: A short, memorable phrase that is repeated to promote a product, service, or idea.
* Mantra: A word or phrase that is repeated silently or aloud for spiritual or meditative purposes.
The best word to use depends on what you're trying to convey.