This was applied to an excellent achromatic telescope of 34 in.
D. conservation - apex just took the test
The Answer is a Stela.
Stela is the upright stone that has incised relief on its surface.
Stela used in ancient civilization, this is a stone which is in upright position. Mostly it was used for the indication of graves but it was also used as dedication. The stone which was fashioned by Maya civilization is known as Maya Stelae.
