Which fruits make up triphala, and why does the commentary call the name apt?

Detailed answer

Verse 6 says bibhitaki has qualities like abhaya, as the Jina taught, so the three together are called triphala. Verses 7-8 praise triphala as nectar on earth that removes all diseases, keeps youth, firms the body, gives intellect, cleanses the wastes and kindles the fire.