agam or agram) is a U.S. diplomatic term for a message sent by courier via the diplomatic bag instead of by telegram.
The words "AIR" and "GRAM" separated by a mark which resembles an elongated "V" is a trademarked design used on envelopes and referred to as an AirGram.
[1] This product is primarily used in quick turn around direct mail to express a sense of urgency to the mail recipient.
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