What a customer support escalation matrix is
An escalation matrix answers one question before it is urgent: when a customer's ticket is not moving, who takes it next, after how long, and how do you reach them? Written down, the answer stops depending on one agent's judgement, on who happens to be online, or on how loudly the customer complains.
Search for the term and you will find several different documents with the same name. An HR escalation matrix routes an employee grievance. A project escalation matrix routes a decision that the working team cannot settle. A procurement matrix routes approvals by value. This page is about the fourth kind: the customer support matrix, where the trigger is the ticket clock and the levels are the people who can fix or reassign a customer's problem.