verbal note

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
VERBAL NOTE. In diplomatic language, memorandum or note not signed, sent 
when an affair has continued a long time without any reply, in order to 
avoid the appearance of an urgency, which, perhaps, the affair does not 
require; and, on the other hand, not to afford any ground for supposing that 
it is forgotten, or that there is no intention of not prosecuting it any 
further, is called a verbal note. 
    

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