Briefle words · Writing & copy
Rule of three
Also called tricolon
Grouping ideas in threes, which readers find complete, rhythmic and easy to remember.
Say it to an AI
Photo-app image overlay for the 30L Carry-On Pack: a three-line tagline using the rule of three, each line a short parallel verb phrase (fits under the seat, opens like a suitcase, lasts a lifetime), strongest benefit last. Max 4 words per line.
How an expert would brief the stronger version of “Sponsored backpack post”.
See it
Try it as a puzzle →A sponsored photo-app ad for Carrow's 30-litre travel backpack, with the tagline set over the product photo.
Why: B has exactly three lines; A's four-item list feels like a spec sheet instead of a tagline.
Related words
Room 4 · Persuasion
Learn “Rule of three” in a five-minute lesson