What is the meaning of よ?

Yoneda embedding

a fish

The hiragana syllable よ (yo). Its equivalent in katakana is ヨ (yo). It is the thirty-eighth syllable in the gojūon order; its position is や行お段 (ya-gyō o-dan, “row ya, section o”).

1. indicates certainty, conviction, or emphasis

   indicates certainty, conviction, or emphasis

   used to make an enthusiastic suggestion

   used as a vocative particle to address someone; O

   Source: wiktionary.org