SOP may refer to any of the following:
1. Short for Super Operator, SOP is the second highest privileged user in IRC (behind founder) that is capable of granting other users rights and controlling the chat channel.
2. SOP is also an abbreviation for standard operating procedure, which is a collection of rules and instructions that if followed will result in a completed task. For example, when you call customer service the agent on the phone line is following the companies standard operating procedure to resolve your question.