I could not find any references related to what does ${#} actually means in shell scripting, My rough guess is that it means the last variable passed to an invocation, but not completely sure.
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No, it means number of positional parameters, the same as $#. For example the following script.sh
#!/usr/bin/env sh
echo ${#}
would print:
$ ./script.sh arg1 arg2 arg3
3
$ ./script.sh arg1 arg2 arg3 arg4
4
Stephen Kitt
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Arkadiusz Drabczyk
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${#}v.$#) – fra-san Mar 19 '21 at 10:50