Mnemonic symbol: ⺊ looks a bit like a pennant.
Someone stuck a flute into the middle of a hollow dinosaur bone to conduct studies on the speed of sound. At the one end of the hollow dinosaur bone is an answering pennant, used in the International Signal Code primarily for the reply “signal is received and understood”, which should be raised as soon as the person is hearing the sound made by the flute.
A pennant with bold red and white stripes flutters brightly in the wind, its pointed end rippling with energy. The fabric is securely fastened to a smooth wooden pole, polished from handling and weather.
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