MCCP
From Muds and Dragons
In computing, MCCP (Mud Client Compression Protocol) is a network protocol that is used in text MUDs for data compression.
Specifically, MCCP is used to compress the output text stream sent by a MUD to a MUD client using zlib, in order to reduce bandwidth usage, resulting in a faster connection. MCCP must be implemented on the server side as well as the client side, and negotiated using the Telnet protocol.
REF: wikipedia
