Millimeter of mercury or mmHg was a unit used to measure atmospheric pressure, measured on an instrument called a barometer or more advanced sensor.
The atmospheric pressure of the planet Taurus II was measured at 70 mmHg. (TOS: "The Galileo Seven")
The unit was also displayed on medical monitors measuring the blood circulation of a person as part of the vital signs. (TNG: "We'll Always Have Paris")
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