A term you'll meet in rhetoric (the rule of three).
A tricolon is a series of three parallel elements — words, phrases, or clauses — of roughly equal length and structure. It's the formal name for the "rule of three," one of the most reliable patterns in rhetoric and one of the most satisfying to the ear.
Caesar's "I came, I saw, I conquered" (veni, vidi, vici) is the perfect tricolon — three short, parallel clauses, rising to a climax. Lincoln's "of the people, by the people, for the people" is another. The form turns a point into something that sounds inevitable and complete.
Three is the smallest number that establishes a pattern: one is an instance, two is a pair, three is a series with rhythm and momentum. It feels complete without dragging. Two examples can seem like a coincidence; four start to feel like a list. Three lands as deliberate, balanced, and memorable.
The most powerful version, the tricolon crescens, grows: each of the three parts is longer or weightier than the last, building to a climax. This rising shape gives speeches their swell and is a favourite of orators precisely because the audience feels the build before the final beat arrives.
When you notice three parallel parts, mark the pattern and ask what the third, climactic element gains from the two that prepare it. The tricolon makes ideas feel ordered and conclusive — which is also why it's worth being a little suspicious of: it can make a weak argument sound complete.
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