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ASCII and Unicode Quotation Marks Guide

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Problem and Background: ASCII grave accent (0x60) and apostrophe (0x27) should not be used together as quotation marks
Old X Window System fonts incorrectly showed ASCII characters as directional quotation marks
Modern systems follow ISO and Unicode standards instead
Recommended Solutions: Use apostrophe character (0x27) as both left and right quotation marks
Unicode provides directional quotation marks U+2018, U+2019, U+201C, U+201D
Unix shell, Perl, Lisp, and TeX maintain correct ASCII character usage
Technical Details: Unicode defines U+0022 (quotation mark) and U+0027 (apostrophe) as neutral characters
ASCII characters were designed for typewriter users only
Modern fonts should show accent characters as mutually symmetric shapes
Implementation: XFree86 4.0 and newer systems use updated BDF fonts with corrected characters
PostScript uses CE encoding vector for correct ASCII character mapping
LaTeX requires upquote package for proper ASCII character mapping