What these signs mean?

[Free Fly]

I see these signs a lot on certain websites but especially on Twitter when someone mentions my name. What do they mean??

Here they are: 💪👊👊💥💥

[MLM]

Often boxes will appear in instances that it is typed with a font that either the website or your computer / hand held device does not support.

[Sam]

> Either the message it is a font that you don't have on your computer or a language for which the language pack is not installed in your system.