The meaning of the Acronym SUM is...

SUM is

• Students Undertaking Missions

More Meanings For SUM:

• Systems Unit Method
• Selective Understanding Markets
• Straight Up Margin
• Students Undertaking Missions
• Summary
• Single User Monitor
• Software User Manual
• Software User's Manual
• Support Upskilling And Multicultural
• SOHO User's Manual
• Summary
• Self Updating Memory

SUM is also in:

• File Extensions
• Funnies
• General
• Media
• NASA
• Religion
• Software