Characters bracketed by quotes create a string.
char =. 'Q'
chars =. 'this is a list of characters'
The quotes are not displayed when the string is displayed.
this is a list of characters
The quote starts and ends a string. A pair of quotes indicates that the quote character itself is in the string.
'put 2 ''s to get 1 '' in the string'
put 2 's to get 1 ' in the string
An unmatched quote is an error.
abc =. 'asdf
| abc =. 'asdf
A string can be empty.
abc =. ''
A string is also referred to as a literal constant or as a character constant.