· ·middle dot, interpunct

The middle dot (a.k.a. interpunct) is often used as a list separator, or in e.g. dictionaries for separating parts of a word (though in Unicode that is technically a different, but most often identical looking character: ).

To produce a middle dot character:

Windows
Alt 0183 (on the numerical keyboard, with Num lock on)
OS X
⌥ Opt . or
⌥ Opt ⇧ Shift . or
⌥ Opt ⇧ Shift 9 (depending on keyboard layout)
Linux
AltGr . or
⎄ Compose ^ . or
Ctrl ⇧ Shift u 00b7 ⏎ Return (or Space)
HTML
· · ·
LaTeX
\textperiodcentered
Unicode
U+00B7

Similar characters: hyphenation point, (separating parts of a word in e.g. a dictionary); multiplication sign, ; Greek interpunct (άνω τελεία, áno teleía), ·; bullet, ; Japanese interpunct (中黒, nakaguro),