In Unicode code charts it looks identical to the U+2019’RIGHT SINGLE QUOTATION MARK,[1] but this is not true for all fonts. The primary difference between the letter apostrophe and U+2019 is that the letter apostrophe U+02BC has the Unicode General Category "Letter, modifier" (Lm), while U+2019 has the category "Punctuation, Final quote" (Pf).
In early Unicode (versions 1.0[2]–2.1.9[3]) U+02BC was preferred for the punctuation apostrophe in English. Since version 3.0.0,[4][5] however, U+2019 is preferred, because it is defined as a punctuation mark. The behavior of Unicode letters and punctuation marks differs, causing complications if punctuation code points are used for letters or vice versa.