An arcsecond, also called a \(\textit{second of arc}\), is a unit of angle equal to \(1/60\) arcminutes, or 1/1296000 of a turn.
The recommended symbol for the arcsecond in the is the \(\textit{double prime}\) (\(''\)).
In combination with prefixes, the symbol \(as\) has also become common, like in astronomy, where very small angles are stated in milliarcseconds (\(mas\)).