Question

What does this represents.please tell in terms of (i^),, (j^) or (-i^), (-k).

Answer 1

These signs denote the direction of the magnetic field.
The 1st 'cross sign' denotes the magnetic field INTO THE PLANE or along Positive K-axis or along k^.
The 2nd 'dot sign' denotes the magnetic field from the plane out wards or along negative K-axis or alg -k^ .
hope it is helpful to you.