# Rule of three used as padding Part of [The AI Tells Index](https://feedsquad.com/ai-tells). A tell signals low effort. It does not identify an author. Skilled writers produce every shape listed here, some of them daily, and automated detectors misread those writers for it at rates measured above 60 percent on non-native English prose. Nothing in this index proves that a machine wrote anything. Read an entry as one piece of evidence to weigh against the false-positive notes printed beside it. ## Facts - Id: rule-of-three-padding - Category: Rhetorical and discourse (rhetorical) - Subcategory: parallelism - Also known as: tricolon, triadic list, rule of three, power of three, verb tricolon, three-item coordinated series - Status: Contested. Credible people dispute that this signals anything at all. - Severity: low - Evidence grade: community-observed (named by practitioners, no formal measurement exists) - Languages: en - Added: 2026-08-14 - Updated: 2026-08-17 - Page: https://feedsquad.com/ai-tells/rule-of-three-padding ## Description Three parallel items in a coordinated series, used as the default shape for every list in a document. Rhetoric calls the figure tricolon and treats it as an emphasis device reserved for a high point. The figure is not the tell. The tell is the figure arriving every few sentences, with a third item that carries no information the first two lacked. The threshold below is a review trigger rather than a measured cutoff. No study publishes a per-thousand-word tricolon rate for human or model prose, so the number comes from arithmetic: at five per thousand words, a 700-word post trips at four tricolons and stays clear at three. ## Why it reads as machine-written A three-item series reads as complete. Two items read as a pair. Four read as an inventory. Models reach for the three-shape when they have one idea and need the cadence of an argument, and Wikipedia's guide ties the habit to making a superficial analysis look more comprehensive. Density does the work here. A reader does not consciously count the series. The reader feels the padding and stops. ## Detection Type: statistical (a measured metric against a threshold with a stated basis) Metric: three-item-coordinated-lists-per-1000-words Threshold: 5 (fires when above) Threshold basis: > No published work compares tricolon rates in human and model prose, which is the main reason this entry is contested rather than active. Five three-item coordinated lists per 1,000 words is a density observation set by FeedSquad, not a measured cutoff, and the tricolon is a deliberate device in speechwriting and legal drafting. Never treat a hit here as a signal on its own. ## Examples Constructed specimens. Written for this index. Never quoted from anyone's posts. ### Specimen 1 Before, exhibiting the tell: > The new dashboard is faster, cleaner, and smarter. It helps teams plan, execute, and review. The result is better visibility, better decisions, and better outcomes. After, repaired: > The dashboard now loads in under a second on a cold cache, down from four seconds. That is the whole change. People stopped opening a second tab to check whether the first one had finished. Note: Nine items across three sentences in the specimen. Not one of them is a number. ### Specimen 2 Before, exhibiting the tell: > Good writing is clear, concise, and compelling. It respects the reader, earns attention, and delivers real value. The best writers understand that structure, rhythm and restraint matter far more than vocabulary. Everything else is style, preference and habit. Get those three right and very little else about a sentence turns out to need deciding at all. After, repaired: > Good writing survives a reader skimming on a phone at the end of a workday. We read every draft on a phone before it ships, and anything that needs a second pass gets cut rather than rewritten. ## False positives Who legitimately writes this way. The tricolon is one of the oldest devices in rhetoric and speechwriters reach for it deliberately, so its presence is close to meaningless on its own. Legal and policy drafting also produces genuine three-item enumerations because the underlying list has three members. No published work compares human and model tricolon rates, so treat this as a density observation and never as a standalone signal. ## Model attribution General, not vendor-specific. Wikipedia lists it as a current sign and The Economist observed it across four chat products in a 2026 rewrite exercise. No peer-reviewed source assigns it to a model family, and one research pass classified the family-level version of the claim as folklore. ## Platform notes - wikipedia: Named as a sign under shortcut WP:RO3, with the stated function of making a superficial analysis appear more comprehensive. - google: Google's spam policy is method-agnostic and turns on value to users regardless of how a page was made. Scaled content abuse also requires many pages, so a single padded post is outside the policy entirely. ## Sources 1. Wikipedia:Signs of AI writing, section Rule of three (WP:RO3) https://en.wikipedia.org/wiki/Wikipedia:Signs_of_AI_writing (tier: community; accessed 2026-08-14) 2. Silva Rhetoricae, Tricolon, ed. Gideon O. Burton, Brigham Young University https://rhetoric.byu.edu/Figures/T/tricolon.htm (tier: primary-doc; accessed 2026-08-14) 3. The Economist, How to spot AI writing (2026-07-30) https://www.economist.com/culture/2026/07/30/how-to-spot-ai-writing (tier: press; accessed 2026-08-14) 4. Heritage & Greatbatch, Generating applause: a study of rhetoric and response at party political conferences, American Journal of Sociology 92(1) 1986 https://doi.org/10.1086/228465 (tier: peer-reviewed; accessed 2026-08-14) 5. vale-ai-tells, 111 machine-checkable rules https://github.com/tbhb/vale-ai-tells (tier: community; accessed 2026-08-14) 6. tropes.fyi pattern directory https://tropes.fyi/directory (tier: community; accessed 2026-08-14) ## Status history Ids are permanent. A retired tell keeps its id and its page. - 2026-08-14, Contested: Opened as contested. Wikipedia's guide names the pattern under WP:RO3 and The Economist reports models favouring three-item lists, but neither publishes a rate, and a separate research pass found no primary source assigning the figure to any model family. Classical rhetoric has treated the tricolon as a deliberate device since antiquity, so the base rate in edited human prose is high and unmeasured. ## License CC BY 4.0. https://creativecommons.org/licenses/by/4.0/ Attribution: The AI Tells Index, feedsquad.com/ai-tells Reuse the data, including commercially. Keep the attribution line. --- Dataset version 1.0.0. Schema version 1. Part of [FeedSquad](https://feedsquad.com). Built by [Herman Foundry](https://hermanfoundry.com) from Levi, Finnish Lapland.