What does 1-U stand for?

1-Unit (1.75 Inches of rack mounting height)

This definition appears very rarely

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1 Year Plan/5 Year Plan One Ass To Risk (sniper term) 1,1-Dichloroethane One Dimensional One-Dimensional Parity Conventional Serial Concatenated Code One-Way Entanglement Purification Protocol 1-Hydroxy-Phenazine Single Target Multiple Hypothesis Tracking First-Order Zero-Disparity One Repetition Maximum (strength measurement)		One-To-One Relationship One-to-Many relationship Burglary of Interstate Vehicle (Birmingham, AL Radio Code) Perfect (rating system) Use Caution/Unknown Situation (Alabama State Police Radio Code) Local Ambulance Clearance (Alabama State Police Radio Code) Out-Of-Town Ambulance Clearance (Alabama State Police Radio Code) Need Paramedic (Alabama Public Safety Radio Code) Signal Weak (police code) Negative (police code)