[PaulHoule]

It drives people nuts but I say there are many characters in Unicode

https://unicode-table.com/en/sets/quotation-marks/

if you need a new kind of quote, so you could write

   Integer index = 77;
   Statement s = « SELECT COUNT(*) FROM that WHERE x = @index »;

People ask me "How do you type those on the keyboard?" and I say, "I don't type them on the keyboard, I cut and paste them." I use >128 codepoints all the time and mostly I don't need to because autocomplete works with them. No reason you can't write

   out.println(√(41.0))

[lproven]

I suggest learning to use the Compose key. For instance with no clipboard use at all, it enables «this».

Compose+<+< and then to close compose+>+>

Also see “curly” quotes: compose+<+" and compose+>+". This illustrates the power of composing: I had forgotten the shortcut, because I rarely use it, but I was able to guess it in 3 tries.