What ’ means
Its position tells you its job. It replaces the missing o in don’t. In the writers’ room, it shows the room belongs to several writers. In ‘hello’, it ends the quotation.
Unicode recommends this same character for the apostrophe, so a smart apostrophe and a closing single quote share one code. An apostrophe-like mark is documented in France in the 16th century for omitted letters or short words.
The curved shape alone doesn’t make a message formal.
For ordinary English plurals, write CDs, not CD’s.
Don't confuse it with
2Questions people ask
1Why does ’ show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type ’
’\2019Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.

