What does M stand for?

M stands for various terms. Discover the full forms, meanings, and possible interpretations of M across different fields and industries.

murmur (heart murmur)
Medical
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Federal Aviation Administration
Maritime (air mass)
NOTAM Contractions
In temperature field means ”minus” or below zero (METAR)
NOTAM Contractions
In RVR Field, indicates visibility less than lowest reportable sensor value (e.g. M0600FT)
NOTAM Contractions
Missing (weather reports only)
NOTAM Contractions
Mountain Standard Time (time groups only)
NOTAM Contractions
Magnetic(Heading)

The "heading" refers to the direction an aircraft is pointing. For a Magnetic Heading, this is in relation to Magnetic North.

Aviation
MEGA(1 Million)

Is a unit prefix in metric systems of units denoting a factor of one million (106 or 1000000).

Aviation
Metre
Clinical

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