Stone Monument
noun
A tombstone made of a big stone is used as a stone monument. These stones are usually so big that they're used for multiple people who died together.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
これが石碑に彫られていた文字です。
These are the words carved on the stone monument.
無人島のはずのこの島に石碑が建っているのはなぜですか。
Why is there a stone monument on this supposedly uninhabited island?
津波が襲った高さの地点に石碑が建てられているのです。
A stone monument was built at the site where the height of the tsunami hit.