What is the meaning of ·?

The product operator.

A decimal point.

The dot product operator.

Indicates what elements can vary.

Indicates addition compounds.

See for the middle dot used in Japanese katakana.

See for the hyphenation point.

Nomenclature of Inorganic Chemistry – IUPAC Recommendations 2005, 2005, p. 28, http://old.iupac.org/publications/books/rbook/Red_Book_2005.pdf

The raised point, used like a semicolon.

the raka

Separates first and last names in personal names transcribed into Chinese characters.

Separates the title of a literary work or collection from the title of a section.

Separates the name of a fixed melody or format from the title of a poem or song.

Separates items in a list in titles.

Separates the month from the day in events, commemorations, etc. named after dates, only used after January ( ()), November (一一 (yīyī)) and December (一二 (yī'èr)) when hanzi are used.

Used in certain forms of gender-neutral writing either before or around the feminine suffix, to avoid both the use of the masculine as the default form and the verbosity of writing out both the masculine and feminine forms.

raised point (άνω τελεία (áno teleía)) or Greek semicolon ( ; ))

Used to indicate a word boundary.

Source: wiktionary.org