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A flat line broken by a sharp spike, standing for a heartbeat.
Also known as: Heartbeat line, Heart rate symbol, EKG symbol
A flat line interrupted by a tall narrow spike is the shape of an electrocardiogram, and stands generally for a heartbeat, vital signs or a monitored patient. The spike is the QRS complex — the ventricles contracting.
Depicts an electrocardiogram trace, the record of the heart's electrical activity. The tall spike is the QRS complex produced by ventricular contraction.
Contexts: Medicine
Used in interfaces and signage to mean heartbeat, pulse, vital signs or health monitoring, usually with no reference to a real trace.
Contexts: Software
A single horizontal line running left to right, broken once by a sharp downward dip, a tall narrow peak and a second dip before flattening again.
Both concern cardiac emergency: the trace shows the rhythm, the defibrillator sign marks the device that treats it.