A single letter, number, symbol, etc.
It is a help character that is used in some versions of Excel.
Go to Insert Symbol and you can do it from the character sets you will find there. You can also use the Character Map facility in Windows to copy the character into Excel.
The name used in Excel for that data type is Text, but it is like the character data type in other computer systems.
Yes.
The hash character which looks like this: #
Usually a character is considered either text or number.
The ampersand, which is this character: &
yes
In Excel it is the "code" function. For example, Code("A") = 65
insert mode
In the default font used by Excel, a letter refers to any alphabet character, a number refers to any numeric character, a symbol refers to special characters like %, $, &, etc., and a punctuation mark refers to symbols like !, ?, comma, period, etc.
The asterisk is a special character and cannot be used in the names of any kind of file.