Invisible/Blank Character?

[DestructioN]

Can anyone tell me what is the Invisible/Blank character? I see alot of people using it for usernames and stuff :/

 

[Slacker]

>> << that is the invisible / blank character =) enjoy and knowledge is power!

 

[Chemical]

This is the invisible character, in-between the 's.
'          '

 

[paul]

A invisible character is still a character. Hold the ALT Key + 2550

 

[Rocket]

Yeah, i've also never figured this out. But I personally have no use for it.

 

[Kasteen]

Like how do people have one lettter usernames? I thought the limit was 3..