SU
SU is widely used in computing to denote privileged or alternate user accounts, and appears in business contexts as a generic term for system users.
Medical
Miscellaneous
Standard Units
Sorceress University
Speak Up
Sensitivity Unit
Supplemented Unit
Superultramodern Unification
Straight Up
Shield Upgrade
Sperm Urinal
Service Unit
Stumble Upon
Community
Governmental
International
Academic & Science
Subresolution Un-attenuated
Sum of Units
Stanford University
Sample Uniques
Sea Urchin
Sampson University
Salisbury University
Sellout University
Student Union
Sofia University
State University
Regional
Computing
Super User
Seismic Unix
Service Unlimited
Switch User
Simultaneous Users
Stand Up
Set User
Substitute User
Syntax Unit
Switch Users
System Userper
Specified User
Scan Udp
Substitue User
Sub-Unit
SUppressor