Circle with slash means you tapped the volumebutton and then selected None. It means you are in silentmode.

what does a circle with a line through it mean in engineering? The ∅ symbol is always drawn as a slashedcircle, whereas in most typefaces the letter Ø is aslashed ellipse. The diameter symbol is used extensively inengineering drawings, and it is also seen anywhere thatabbreviating diameter is useful, such as on cameralenses.

Also know, how do I get rid of the circle on my Android?

Disable device in the Circle App

Open the Circle app and go to Menu >> Circle Go. Swipe left on the device youd like to disable. (On an Androiddevice, long press on the device.) Tap Delete.

What symbol is a circle with a diagonal line through it?

English: The no symbol (also known as aprohibition sign, no sign, circle-backslash symbol,nay, interdictory circle, or universal no) is a circlewith a diagonal line through it (running from top left tobottom right), surrounding a pictogram used to indicate somethingis not permitted.