Using of unicode with a TStringGrid

Question

I`d like to define a string constant with mixed greek and cyrillic symbols. Something like this

const
  some_const = 'cyrillic symbols' + $03C9;

where $03C9 is the lower case letter omega from there.
Maybe, I`ll should make some_const a variable in a datamodule and initialize it.

//datamodule
var
  some_const = 'cyrillic symbols' + some_function_to_make_string($03C9);

So, what is a correct function for some_function_to_make_string(code : Word)?

Can I use this some_const with a TStringGrid.Cells[aCol, aRow]?