What is the meaning of ·?

The product operator.

A decimal point.

The dot product operator.

Indicates what elements can vary.

Indicates addition compounds.

A pointing mark in Anglican chant, which indicates nonstandard places in the text where the chant should change note.

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 'namer dot' that optionally precedes proper names to mark them as such.

The raised point, used like a semicolon.

the raka

middot, middle dot (called punt volat (flown dot) in Catalan, and found in the combination l·l to distinguish it from the digraph ll. It was once used for elision, especially in poetry.)

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 ( ; ))

Alternative form of , the word divider.

Alternative form of 𐆑, the uncia, found on coins

Source: wiktionary.org