One of MANY hornorifics that Discordians use in their signatures.
It is from Principia Discordia, and is usually abbreviated KSC.
On page 33 of the fourth edition of Principia Discordia:
"THE GOLDEN APPLE CORPS
"The Golden Apple Corps is an honorary position for The Keepers of the Sacred Chao, so that they can put 'KSC' after their names.
"It says nothing, does less, means nothing."