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NTSC 60 is just a tiny fraction of a Hertz less than 60 Hz (59.xxxxx Hz) and this was used with North American TV to avoid beating with the 60 Hz AC power (I believe?). Nearly all computer displays anyone will be likely to have today should work fine on 60 Hz so that NTSC 60 will mostly be an obsolete and unnecessary choice. Most LED based screens will work on both 60 Hz (North American) and 50 Hz (European) power systems.