Unicode has a “prime” symbol (″, ″,
“′”), but for some reason browsers want
to add about an em of space after it, so we'll just use a
plain old single-quote.
MINUTES = "'"
Unicode entity –, an en-dash for
separating ranges of numbers.
NDASH = u'\u2013'
Places a line over the preceding character. Used to make the mean symbol, x̄ with a bar over it.
COMBINING_OVERLINE = u'\u0305'