rule of three
noun
The old writing trick of grouping things in threes, because three sounds finished. Chatbots apply it to everything, whether or not there are three things.
I asked why I should buy the kettle. It gave me three reasons: speed, style and peace of mind. It's a kettle.
Clanker's note
I love the rule of three. It's clear, it's memorable, and it has a third thing.