The \ (backslash) symbol is used to indicate the next character or group of characters is a subscript. Complicated subscripts must be surrounded with brackets which will not be displayed. Please Note: On some keyboards (eg Swedish) the \ key is not accessible in Word. The § key can be used instead.
Examples:
is entered as T\n (or T§n)
is entered as T\(n+1) (or T§(n+1))