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Etymology
Compound of 🇰🇲.

Literally, refers to how the inflected endings are located in the gojūon table. means the vowel i, which is written above the vowel e, the other inflection-related vowel. means only one vowel is involved, since each of the table contains one vowel. Thus this can be understood as “one-voweled conjugation in i”.

Noun

 * 1)  a verbal conjugation class in which the verb stem ends in -i and consists of four alternating bases: -i, -iru, -ire, and -iyo/-iro

The subscripts in the table above indicate differences in vowel class that were already being lost in. It remains unclear what those different vowel classes may have meant. See for more details.