Iota Subscript and Adscript

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It is convention to print the glide ι of the long vowel diphthongs αι (when the α is long), ηι, and ωι underneath the vowel like this: ᾳ, ῃ, and ῳ. This ι is called iota subscript. Occasionally a modern edition will print the iota in line with the text. In this case, it is called iota adscript.

In the Classical Period, the glide of long vowel diphthongs αι, ηι, and ωι was both written and pronounced. So we find it written in inscriptions, like this:

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By the end of the 2nd century BCE, the glide had dropped in both spelling and pronunciation.

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