It's called an Interpunct.

You are probably referring to the interpunct character (U+00B7) (·) which is a centered dot (e.g: int·er·punct). Although seeing as the interpunct is not commonly known, a hyphen is sometimes used instead (e.g: hy-phen).

Well, I went looking for a way to make an interpunct because I needed to use one and I found something useful for some situations. This website, http://www.statemaster.com/encyclopedia/Interpunct, has some helpful HTML codes for making interpuncts. I found that they don't work when I tried to send one through e-mail, but a couple did work when I was using their codes for an online custom bracelet. I don't know if this is helpful or not, but it has helped me.

Symbol Character Entity Numeric Entity Unicode Code Point Notes

· · · U+00B7 interpunct, middle dot

· · U+0387 Greek ano teleia

⋅ ⋅ ⋅ U+22C5 dot operator (mathematics)

• • • U+2022 bullet, often used to mark list items

‧ ‧ U+2027 hyphenation point

・ ・ U+30FB fullwidth katakana middle dot

･ ･ U+FF65 halfwidth katakana middle dot

ּ ּ U+05BC Hebrew point dagesh or mapiq

Characters in the Symbol column, above, may not render correctly, if at all, in all browsers.

For most North American Microsoft operating systems using OEM Code page 437, the Alt Code is 250