Graphical representation of<unk> <unk>  is an imaginary formation of three limb leads in a<unk>  used in electrocardiography, formed by the two shoulders and the pubis. The shape forms an inverted equilateral<unk>  with the heart at the center. It is named after Willem<unk> , who theorized its existence.<unk>  used these measuring points, by immersing the hands and foot in pails of salt water, as the contacts for his string galvanometer, the first practical ECG machine.
Einthoven's triangle
Sherren's triangle
McBurney's point
Dandy's point
Klein's line
Hilgenreiner's line
Schwalbe's line
Blumensaat's line