The best way to say hello.

Raise your hand up

A waving hand smiley.

Commonly used on habbo as a code to wave your hand in the air..

high five.

appropriate response is \o

The 1 hand version of "\o/" (a puppet with arms in above the head, shouting 'hurray'), resembles nazi right arm greeting used in ww2.

o/ is a symbolic gesture meant to roughly portray a person saluting in the same style as nazis did, and is used by far right/alt-right users to subtly express their thoughts on text without explicitly saying it.

In other words, it’s used by the based and red-pilled.

Just a simple wave