Call The ice giants from the north beyond the wall. Boatswain whistle approximately 101mm long comprised of permafrost Ghost blue Stardust and cobalt infused with silver.
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Used on naval ships by a boatswain. Historically the boatswain's call passed commands to the crew when the voice could not be heard over the sounds of the sea. Because of its high pitch, the whistle could be heard over the activities of the crew and bad weather. Now used in traditional bugle calls such as Evening Colors/Sunset, and in other ceremonies in most modern navies.
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I myself have done a good deal of backpacking and have spent a lot of time in the woods where I get separated from the other people in the party. Whistles carry far more distance than the voice alone and do not wear out your vocal cords with repeated use. A necessity for any bug out survival kit and a great gift for all the outdoor adventure people. Possibly good for warding off abominable snowman and yeti azwell☃️