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Twelve views, named by convention.
Also known as: Electrocardiogram lead names, 12-lead labelling
The convention naming the leads of an electrocardiogram by letters and numbers.
Names each of the twelve views of the heart's electrical activity recorded by a standard electrocardiogram.
Contexts: Medicine, Laboratory
The twelve leads come from ten electrodes, so the labels name computed views rather than physical wires — which is why there are twelve leads and not twelve cables.
Contexts: Medicine, Laboratory
The augmented leads carry an 'a' for augmented and a letter for the limb, so the label states how the view was derived as well as where it looks from.
Contexts: Medicine, Laboratory
Labels printed beside each trace: roman numerals for the limb leads, aV with a letter for the augmented leads, and V with a number for the chest leads.