The technique you're describing is known as "Triangulation." In the context of estimating story points in Scrum, triangulation involves comparing a new user story with other user stories that the team has previously estimated. If the new story seems larger than a story that was estimated as 5 points but smaller than a story that was estimated as 13 points, the team might assign it a value that falls between these two, such as 8 points. Triangulation can help teams make more accurate estimations because it forces them to consider their past experience and how the new story compares to work they've done before.