[tex]{ \qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
The shown figure is that of a " line " ( that can be extended )
It can be represented by the Two outermost points lying on it or by all the points lying on it as well, with a line over head having arrows in both directions.
Mostly Two outward points are used while representing a line , so we can depict the given one as :
[tex]\qquad \sf \dashrightarrow \: \overleftrightarrow{AI }[/tex]
and
[tex]\qquad \sf \dashrightarrow \: \overleftrightarrow{ IA}[/tex]
