The meaning of the Acronym SM is...

SM is

• Structural Model
• Service Module ( Apollo)
• Surface Mount
• Systems Management
• Support Module
• Soft Manual
• Stable Member
• Shuttle Management (KSC)
• Short Module
• Service Model
• Secondary Mirror
• Science Mission

More Meanings For SM:

• Simple Mainloop
• Shell Model
• Maillist (SoftSpoken Mailer)
• Script (ScriptMaker)
• Smalltalk language source code file
• Text document (Samna Word)
• Set Mode
• Software Modem
• Shared Memory
• System Manager
• Super Mini
• Spell Menu
• Scheduler Message
• Small Machine
• Smart Media

SM is also in:

• Assembly
• File Extensions
• General
• Hardware