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Pinning points form when part of a floating ice sheet anchors itself to an elevation on the ocean floor, creating a visible bump on the otherwise smooth ice shelf surface.

Yet, Jane — Tomalin calls her “the true heroine of this story” — remained the sheet anchor of his life, as well as his typist.

But to Abraham Lincoln, these principles were “the sheet anchor of American republicanism.”

The feels "the world has enough problems without losing the surety of its sole superpower, the country which despite its faults remains the sheet anchor for the world's security and economy".

They have a number of policy levers they can utilize or balance sheet anchors that represent dry powder to withstand market volatility.