Morse code Huffman tree. For some stupid reason, it never occurred to me that Morse code is a Huffman code. In retrospect, it seems obvious that David A. Huffman basically just generalised the concept.
https://snabeltann.no/media/HmzMrQ9mgWWIgohCEfE
@thor
Not really a Huffman tree, since every value has to be a leaf node to disambiguate compressed values. Huffman trees tend to be more asymmetrical.
http://www.binaryessence.com/dct/deG00027.gif
@skypage I think Huffman code is what comes about if you attempt to do a Morse-like code as a uniform stream of binary digits.
@skypage As for asymmetry, you could choose to make a Huffman tree more balanced if you wanted. At that point, it's more of a prefix code than a true Huffman code, but the principle is the same.