A noun for “encampment” used as the name for the region where the Bëorians settled (S/142). This word superficially resembles the verbal noun of a (hypothetical) a-verb *estola- “to encamp”. Such a verb might be a combination of √ET “out” + √TOL “stick up” referring to the erection of tents, where ancient t + t became st as it often did with suffixion. This is all rather speculative, however.