what type of error is this 0

[qwertyu1]

the ashoka symbol is shifted 90 degree anti clockwise on the back side

[Greenstang]

It's called a Rotated Die.

[thebeav]

That used to be a common type of error on our coinage. Coin dies today have flats and notches that prevent them from rotating during use.

It's fairly easy to find 'rotated reverse' Indian cents, as an example.....

[Just Bob]

10 hours ago, thebeav said:

That used to be a common type of error on our coinage. Coin dies today have flats and notches that prevent them from rotating during use.

It's fairly easy to find 'rotated reverse' Indian cents, as an example.....

Very common occurrence on tokens, also.