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'''Einthoven's triangle''' refers to a metal bar bent into a triangle shape that is typically played musically by a percussionist. It was invented by Willem Einthoven when he was bored reading [[230-Lead ECG|electrocardiograms]].<ref>[http://gomerblog.com/2016/03/ecg-of-the-day-toilet-paper-invented/ This Day in Medical History: ECG of the Day Toilet Paper Invented]</ref><ref>[http://gomerblog.com/2016/10/maker-ekg-pads-now-recommends-230-lead-ekgs-patients/ Maker of EKG Pads Now Recommends 230-Lead EKGs for Patients]</ref>