Ic is widely used by Hong Kong Minecraft Server Society because they think type 'Ic' is faster than 'I see'
1:Trying to response people
2: Tell people that I receive something
3:Have a same meaning of 'OK'
1: A: My computer was broken! B: Ic, maybe we can buy a new one tomorrow.
2: A: I have already sent you the draft. B: Ic, I will check it later.
3:A: I want to sleep B: Ic, good night! :)