40m

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40m or 40 m stands for:

40 meters , length indication
40 meter band , shortwave frequency range
40 minutes in 00h: 00m: 00,00s- Stundenmaß representation

40M or 40 M stands for:

40 Mark (GDR)
40M Nimrod , Hungarian anti-aircraft tank
40M Turán I, Hungarian tank, see Turan (tank)

See also:

M40