So it's trigonal because we have these three atoms that are bound to the central atom here, and if you picture it, it's actually shaped like a pyramid.
Over the last several years, the world has woken up to the enormous market potential of serving 2-3 billion people at the base of the economic pyramid.
The Great Pyramid, a 146-metre-high mountain of stone, was created by arranging 2.3 million limestone blocks, each about 2.5 tonnes, with astonishing accuracy.
