(idea) by Tem42 Wed Aug 21 2002 at 0:39:39

Usually this is an initialism of 'No later than', or 'Not later than'.

It can also be an abbreviation of 'night letter', a telegram sent at night, to be delivered the next morning. This results in a lower rate.

Other initialisms are:
'New Living Translation' (a translation of the Bible).
'Not Less Than'
'Navy Liaison Team'
'No Load Test'

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