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This icon that you're talking about means that something is wrong with the audio output. It could be due to a number of things. Call the apple support line to sort it out.
The Red number is the number of people wanting you to Accept or Decline their request for you to add them to your contacts. Look in the "Recent" list to see who is waiting for your response (has a small number next to the icon) then click their name and Block ( or Decline or Accept ) their request - the Red number will disappear if zero.
A circle around the number indicates a spilt.
an outlook on a career
it means the military or terrorist group you are playing for
It means that there are new unread items in your inbox.
An open circle is usually found on a number line in math. An open circle usually represents a number that is not included in the line.
It means the circumference of a circle
It means "draw a circle around the prime number"!It means "draw a circle around the prime number"!It means "draw a circle around the prime number"!It means "draw a circle around the prime number"!
If you mean Pi as regards to a circle then it is an irrational number
what does it mean
It means that the value represented by the circle is part of the solution set.