STO: Sales to Order: STO: Scheduled Time Off: STO: School Tuition Organization: STO: Science & Technology Objective: STO: Security Through Obscurity: STO: Sell to Open : STO: Sensor Technology Office : STO: Service to Others: STO: Shad Taking Over : STO: Short Takeoff: STO: Short-Term Observers: STO: Shutdown Turnaround Outages : STO qKLN8.