The story
From its continued use until the 1980s in reference to the US Geological Survey's 1927 geodetic datum.
Etymology from Wiktionary, CC BY-SA 4.0.
survey mile
Today it means: The mile of ⁶³³⁶⁄₃₉₃₇ kilometers employed by the United States prior to its adoption of the international mile by treaty in the 1950s. Full definition →