Sinclair QL Beginner's Manual page 5

The left cursor together with the CTRL key acts like a rubber. You must hold down the CTRL key
while you press the cursor key. Each time you then press both together the previous character is
deleted.
ENTER
The system needs to know when you have typed a complete message or instruction. When you have
typed something complete such as RUN you type the ENTER key to enter it into the system for
action.
Because this key is needed so often we have used a special symbol for it:

We shall use this for convenience, better presentation, and to save space. Test the  (ENTER) key
by typing
PRINT "Correct" 
If you made no mistakes the system will respond with
Correct
OTHER KEYBOARD SYMBOLS OF IMMEDIATE USE
* multiply
_ underscore
"
quotes
, comma
; semi colon
: colon
\ backslash
( left bracket
+ add
= becomes equal to (used in LET)
'
apostrophe
! exclamation
& ampersand
. decimal point or full stop
$ dollar
) right bracket