quote - (') transpose operator, string delimiter
quote ( ' )is used for (Conjugate) Transpose of matrix.
quote ( .' )is used for (non Conjugate) Transpose of matrix.
Simple (') or double (") quotes are also used to define character strings. (Character strings are defined between two quotes). A Quote within a character string is denoted by two quotes.
[1+%i, 2]' [1+%i, 2].' x='This is a character string' 'He said:''Good'''