It can be quite hard to tell what character is concealed behind the █ symbol, as there are a wide variety of characters that could potentially be behind it! It would be useful to have more information in order to identify the character.
If you can provide more information such as:
- Any context or other information the character may be referenced in
- Any other characters that are mentioned in the same context
- Any images associated with the character
It would be easier to make an educated guess at what the character might be!
You may also be able to find some clues as to what character is being hidden as the █ symbol by doing Google searches related to the context or other characters that are mentioned on the page. It’s worth having a look around and seeing what comes up!
If all else fails, the best option would be to email the website owner, writer or publisher of the material to ask what character is concealed behind the symbol.
I hope this helps you in some way to identify the character!