what is an interpunct? (the worlds best ever)

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what is an interpunct?

prince-street-interpunct.jpg

While searching for grammar usage(seriously), I came across this interesting thread on PainInTheEnglish. Initially, it was the interest in the triangular symbol between Prince and St that got me to click through. Then I got to read the comments, wow. So what is an interpunct?
According to Wikipedia
"An interpunct ยท is a small dot used for interword separation in ancient Latin script, being perhaps the first consistent visual representation of word boundaries in written language."
There you have it.