but why #! and not 00 or /// or any other sequence of characters?
#! is encoded to the bytes 23 21 which is the magic number of an executable script. A magic number is a sequence of bytes at the beginning of a file that allows to identify which is the type of a file, for example, a png file will always begin by the bytes 89 50 4E 47.
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Also to answer the question
#!is encoded to the bytes23 21which is the magic number of an executable script. A magic number is a sequence of bytes at the beginning of a file that allows to identify which is the type of a file, for example, a png file will always begin by the bytes89 50 4E 47.