Share of voice
Also called AI share of voice, SOV.
Share of voice is the proportion of AI answers about your category that mention you at all, across a fixed set of buyer questions — not your position within an answer.
What we can add
It is a presence measure, and reading it as a ranking is the usual mistake. A firm at zero is not ranked last; it is not in the conversation, which is a different problem with a different fix — you are trying to get mentioned, not to move up.
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