stone tower; stone pagoda
Refers to a tower or pagoda made of stone, often found in Buddhist temple grounds or cemeteries.
寺の境内に古い石塔が立っている。
An old stone pagoda stands in the temple grounds.
Used for a stone monument marking a grave; often part of a family grave site.
お墓参りに行って、石塔に花を供えた。
I visited the grave and offered flowers at the tombstone.
Compound of 石 (stone) and 塔 (tower, pagoda). The reading せきとう is the on'yomi of both characters.