What is the meaning of x buttons in android Mobile?

I have seen an "X" mark button in my android mobile. I tried to know more about it so searched for this in Google but everyone says, " it is used for closing an application". I don't want to know about the cross symbol. Instead, i want to know about the cross button. Do you know about it?

Related Discussions:

• What is the meaning of CynogenMod in Android?
• How to modify the look of the onscreen buttons in android?
• What is the meaning of PdaNet in Android?
• What is the meaning of Bluetooth 4.0(LE)?
• What is the meaning of Bricked Phone in Android mobile system?
• Screen of LG Optimus S goes black but all 4 buttons flash
• How to fix Virgin mobile w/ LG prepaid phone?
• Is it possible to illuminate the capacitive buttons of Android based Samsung Epic 4G for longer period?
• How to use volume buttons to turn pages on Kindle for Android?
• What is the meaning of Google Now in Android?