Unicode has "combining characters". How to use them?

Question

with combining characters one can use 2 unicode characters at single location, creating a composition of two graphics. I'm thinking about simple ascii art, I would need to first use, as wikipedia says "SQUARE WITH HORIZONTAL FILL" ▤, and then on top of that, the letter "A". How to accomplish this?

Answer 1

What is possible with the method you describe is a kind of abuse of diacritical marks. Fell free to play around a bit with it using following demo ( http://demo.danielmclaren.com/2015/diacriticism/ ).

Below some screenshots of the Unicode code I have got from the demo above:

Claudio.txt content copied to a terminal

Claudio.txt displayed in gedit

Claudio.txt displayed in SciTE

Sorry, but I don't know at the moment why exactly the representation of same underlying Unicode text is looking different in SciTE.

Here the HexCode of the Claudio.txt file:

Claudio.txt displayed as hex code in GHex

and here the Unicode copied/pasted to the stackoverflow answer editor box:

C̱̙̳̲͇͉̄̄̚l̝̩̩̝̺̠͞ā̝͉̩̟͆u̻͈̘̞̪̅̿d̝̄̅͆̚i͇̙͈̎̚o̘̟̎̄̄̎

As you have to be able to show ASCII art in a terminal I assume that there is no way to overlay two arbitrary Unicode characters for this purpose.