Actually, IMO the correct and more dignified term is UDT --"Unified Dive Team"-- a term I first heard used by John Walker and Michael Kane, circa year 2000 and saw before in the old rec.scuba newsgroups.
I first saw "Unified Team" used in print in the article Evolution of DIR Principles by JJ.
Extract...
"As a well-defined, standardized system, DIR was designed to maximize efficiency across multiple environments in order to promote safety and fun. Among its key principles are:
Unified Team
Central to the DIR diving system is the concept of a unified team. This system pairs divers of similar capacity within an environment that they are properly prepared for. Teams of individually capable divers produce a level of safety and efficiency beyond what is capable while diving independently."
JJ also wrote about "Unified Team" as part of the "DIR System" in his book Doing It Right: The Fundamentals of Better Diving (pages 40-42).