What's in a name?
The name SYN/HAK means a couple of things. First, it is a nod to the terms SYN and ACK from computer networking. A SYN/ACK handshake is the first step in opening up a TCP connection. The SYN stands for "Synchronize", while the ACK is for "Acknowlege".
In SYN/HAK, the SYN is still the same, but HAK obviously means "Hack". SYN/HAK is a place for people to come together and hack.