What is the meaning of ?

Encloses a quotation in CJK languages.

Encloses a quotation.

Encloses an embedded (inner) quotation.

Encloses a quotation.

Encloses the title of a work, such as book, movie, etc.

Encloses character dialogue.

In kanji-katakana mixed writing before World War II, encloses 外来語 (gairaigo, foreign loanwords) written in katakana to mark them apart from ordinary katakana portions of the text.

Source: wiktionary.org