Why 'IND' is written on Indian Vehicle number plates?

On Indian vehicle number plates 'IND' is written. Do you know the meaning of 'IND'? What is the significance? Why it is written on many vehicle number plates? What is High-Security Registration Plates and features?
On Indian vehicle number plates 'IND' is written. Do you know the meaning of 'IND'? What is the significance? Why it is written on many vehicle number plates? What is High-Security Registration Plates and features?

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