What is the meaning of エ?
yes
The katakana syllable エ (e). Its equivalent in hiragana is え (e). It is the fourth syllable in the gojūon order; its position is ア行エ段 (a-gyō e-dan, “row a, section e”).
The katakana syllable エ (ye). Its equivalent in hiragana is 𛀁 (ye).
Source: wiktionary.org