Shelf ice is a term that typically refers to a large, floating ice sheet that has broken off from a glacier or ice shelf. This type of ice is also commonly known as ice shelf or ice sheet. Other synonyms for shelf ice include a floating ice mass, glacier ice, ice floe, pack ice, polar ice, sea ice, and ice shelf. Each of these terms describes a similar type of ice formation that is found in the polar regions of the world. These massive ice sheets are important for global climate regulation and provide a unique and fascinating ecosystem for scientists to study.