What does the shell variable $0,$ in Linux mean?

The basic meaning of shell variable $#,[email protected],$0,$1,$2 in Linux:
Variable Description:
$$
The PID of the shell itself (ProcessID)
$!
PID of the Shell's last running background process
$?
End code of the last Run command (return value)
$-
Flag at a glance using the SET command
$*
All parameter lists. such as "$*" in the Case of "" ", in the form of" $ $ ... $n "output all parameters.
[Email protected]
All parameter lists. such as "[email protected]" with "" "in the case, with" $ "" $ "... All parameters are output in the form "$n".
$#
Number of arguments added to the shell
$
The name of the shell itself
$1~ $n
Each parameter value added to the shell. $ $ is the 1th parameter, and the $ = is the 2nd parameter ....

Instance:

$ vim dollar.sh

#!/bin/bashprintf"The complete list is%s\n" "$$"printf"The complete list is%s\n" "$!"printf"The complete list is%s\n" "$?"printf"The complete list is%s\n" "$*"printf"The complete list is%s\n" "[email protected]"printf"The complete list is%s\n" "$#"printf"The complete list is%s\n" " $"printf"The complete list is%s\n" " $"printf"The complete list is%s\n" " $"printf"The complete list is%s\n" " $"

Results show:

[Email protected]]$SHDollar.SH 123456 654321QQ wwthe complete list is3278The complete list is0The complete list is123456 654321QQ wwthe complete list is123456The complete list is654321The complete list are qqthe complete list is wwthe complete list is4The complete list is dollar.SHThe complete list is123456The complete list is654321The complete list is QQ

What does the shell variable $0,$ in Linux mean?