Movement is a brand's week-over-week rank change on an AI visibility index — up, down, unchanged, new entry, or re-entry — the AI-ranking equivalent of a price change on a ticker.
Movement notation is compact: ↑3 means up three positions since last week's close, ↓2 means down two, — means unchanged, NEW marks a first appearance, RE a return after dropping off. Every movement compares against the prior weekly close, never an arbitrary window.
Sustained movement matters more than a single week. One position swap can be answer-to-answer noise; a brand climbing across four consecutive closes reflects something real changing in the sources and answers underneath.