What does SUM stand for?

Sony U-Matic Videotape

This definition appears very rarely

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Scalable Uncertainty Management Science Utilization Management Senter for utvikling og miljø (Centre for Development and the Environment; Norway) Servicio Universitario Mundial (Spanish: World University Service) Simplified Unified Messaging Single Event Upset Monitor Single User Monitor Small Submarine Underwater Module Software Updates Management Software User's Manual		Spacecraft User Manual Standard USAREUR Munitions Startup Manager (software) State of the Union Message Stupid User Mistake Sumas, Washington (border patrol station) Sumerian (non-Indo-European; linguistics) Summary supramammillary nucleus Surface-to-Underwater Missile