Post reach
In short
Post reach is the number of unique subscribers who saw a publication; it is measured over the first 24–48 hours and is the main signal of whether a post landed with the audience.
Reach is the number of unique users who saw a publication. One person opening a post three times adds three to the view count but only one to reach.
How to measure it: take the reach over the first 24–48 hours from the channel statistics — that is the clean response to the post, without the effect of later catch-up views. A healthy channel sits at 30–60% of its subscriber count; a sharp drop usually means audience fatigue or content that misses the mark.
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This term is also available in Russian.