Many years ago I used Latex extensively and so had the ‘muscle memory’ for \ character sequences.
I am using Julia this afternoon and I can see how the muscle memory for \ pm TAB and characters like this can be attained.
However I had an idle though - in old times there were APL keyboards with the funny symbols for that language. I guess a Unicode keyboard would be enormous and there are different ranks (*) of Unicode.
Is there a utility which maybe present an on-screen panel of characters to choose from using a mouse?
A search reveals this keyboard. I now must have one…