The meaning of the Acronym OSN is...

OSN is

• Operator Security Number

More Meanings For OSN:

• Operand Segment Number
• Original Senshi Network
• Operator Security Number
• Ocean Science News
• Origami Societeit Nederland
• Online Submission Number
• O Scale News
• Old School Nintendo
• On Shelves Now
• Orion Syndicate Network
• Online Scouting Network

OSN is also in:

• Assembly
• Media
• Networking
• Ocean Science
• Scouting
• Security
• Unfiled