The part of a ridge above sea level; like a sail on a sailboat, it catches wind and moves the ice.
Cryosphere glossary - nsidc
https://nsidc.org/cryosphere/glossary/S

https://www.wikiwand.com/en/Pressure_ridge_(ice)

By Photos courtesy of Ben Holt and Susan Digby - http://sealevel2.jpl.nasa.gov/jr_oceanographer/oceanographer-holt.html, Public Domain, https://commons.wikimedia.org/w/index.php?curid=5043646