haplography

Haplography is the act of writing once what should be written twice.

There are various instances of conventionalized haplography in English.

This is called haplography.

For example, the English word idolatry, the worship of idols, comes from the Greek eidololatreia, but one syllable has been lost through haplography.

Thus, the coin seems to lend support to the hypothesis by Frank Moore Cross from 1975 that there were two subsequent father/son pairs of high priests called Johanan and Jaddua, the latter pair of which was accidentally omitted from the biblical text because of haplography.