This crossword clue is for the definition: Subtle signal.
it’s A 13 letters crossword puzzle definition.
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Possible Answers: NOD.
Last seen on: LA Times Crossword 5 May 2018, Saturday
Random information on the term “NOD”:
A nod of the head is a gesture in which the head is tilted in alternating up and down arcs along the sagittal plane. In many cultures, it is most commonly, but not universally, used to indicate agreement, acceptance, or acknowledgment.
Different cultures assign different meanings to the gesture. Nodding to indicate “yes” is widespread, and appears in a large number of diverse cultural and linguistic groups. Areas in which nodding generally takes this meaning include the Indian subcontinent (note that the head bobble also shows agreement there), the Middle East, Southeast Asia, most of Europe (see below), Latin America and North America. Nodding may also be used as a sign of recognition in some areas, or to show respect. An insult may be inferred if it is not returned in kind.
In Greece, the single nod of the head down that indicates “yes” is often combined with closing the eyes simultaneously. This nod commonly also includes a very slight, almost unnoticeable, turn of the head to the left (or to the right).