One can argue that its more a typographic issue than a font issue.
The author probably did see a "pi", but should have been using an embedded font, or even better, the unicode "GREEK SMALL LETTER PI", π.
The author probably did see a "pi", but should have been using an embedded font, or even better, the unicode "GREEK SMALL LETTER PI", π.
[1]: http://www.fileformat.info/info/unicode/char/03c0/fontsuppor...