Angle between Magnetic meridian and Geographical meridian is called:

Concept:

Elements of Earth's Magnetic Field:

• The magnitude and direction of the magnetic field of the earth at a place are completely given by certain quantities known as magnetic elements.

Magnetic Declination (θ)or magnetic variation:

• It is the angle between geographic and magnetic meridian planes.
• Declination at a place is expressed at θ° E or θ° W depending upon whether the north pole of the compass needle lies to the east or the west of the geographical axis.

The angle of inclination or Dip (Φ):

• It is the angle between the direction of the intensity of the total magnetic field of earth and a horizontal line in the magnetic meridian. 

Explanation:

• The angle of inclination or Dip is the angle between the direction of the intensity of the total magnetic field of earth and a horizontal line in the magnetic meridian. 
• From above it is clear that the angle between geographic and magnetic meridian planes is known as the angle of declination or magnetic variation.

Additional Information

• The magnetic field of the Earth along the vertical is known as the vertical component of Be. 
• The magnetic field of the Earth along the horizontal is known as the horizontal component of Be.