What do the squares mean on FB?

robyrob or anyone who knows what the squares mean in the above pictures, please reply. Thanks. I would like to know.

those would be undisplayable characters - either an emoji or character from a font that you don't have installed and so your browser can't display it

What do the squares mean on FB?


Use special characters on Facebook to make statuses and comments more interesting for viewers. The square symbol doesn't have a specific meaning but it can be an add-on or used to replace a similar letter or symbol. Symbols on Facebook can be pasted in or entered with ASCII code. (...)


ASCII Code

There are many ASCII codes to represent different squares. For a plain black square, the code is 254. For a square made of dots, it's 178. For a small off-center square, the code is 220. Hold down "Alt" and type in the ASCII code to show the character. Use the number pad to enter the code. (...)


Character Map

The character map on Windows shows every character that you can type with your keyboard. To open it, display the Charms bar, click "Search" and type in "Character map." Click the program to display the characters. Choose different characters sets from the drop-down menu; "Symbols" has several square icon options. Scroll through the list to find the square symbol you want to use and then highlight it. Copy it and then paste it into a Facebook post.(...)


Tips

Use symbols in your updates sparingly. A few can make a nice impact and draw attention to your post, but too many make it hard to read.
The square symbols usable on Facebook appear large next to the letters you type, so your icon will stand out when you paste it.

http://science.opposingviews.com/use-square-symbol-facebook-23418.html

Thanks robyrob and Foggy.