What does the S in apple's 4S Iphone stand for?

What does the S in Apple's 4S Iphone stand for?

Speed

Seri the voice that you ask questions too

Serri it's like a robot app where you can talk to her and tell her to do stuff. It ranges from having her read u a bed time story, call you princess, or give you directions on where to go.

Siri. Your personal assitant whoch you can ask questions and put alarms, send messages and lots of other stuff.