Quotation Marks & Apostrophes in ASCII and Unicode
It's correct (0x27). It´s ugly (0xb4). It`s horrible (0x60). It’s perfect (U+2019).
Today I filed a bug, probably the most trivial bug of the time, about the use of Unicode quotations marks and apostrophes in the Online Help pages 
It is just indistinguishable: ‘ and ’, in some type fonts, especially size is small. But with the help of Unicode convertor I was able to tell the difference: ‘ is ASCII 0×27, the Apostrophe and ’ is Unicode U+2018, the Right Quotation Mark.
However 0×27 is often overloaded with various meanings (since it is on your keyboard…) such as prime, single quote, apostrophe… So if Unicode is used, it is best to use the Unicode version (the curly ones) in your application/pages.
See Markus Kuhn’s special page for more information.
The Unicode and ISO 10646 standards define the following characters:
| U+0022 | QUOTATION MARK |  |
neutral (vertical), used as opening or closing quotation mark; preferred characters in English for paired quotation marks are U+201C and U+201D |
| U+0027 | APOSTROPHE |  |
neutral (vertical) glyph having mixed usage; preferred character for apostrophe is U+2019; preferred characters in English for paired quotation marks are U+2018 and U+2019 |
| U+0060 | GRAVE ACCENT |  |
|
| U+00B4 | ACUTE ACCENT |  |
|
| U+2018 | LEFT SINGLE QUOTATION MARK |  |
|
| U+2019 | RIGHT SINGLE QUOTATION MARK |  |
this is the preferred character to use for apostrophe |
| U+201C | LEFT DOUBLE QUOTATION MARK |  |
|
| U+201D | RIGHT DOUBLE QUOTATION MARK |  |
