'Okina

The ʻokina, also called by several other names, is a unicameral consonant letter used within the Latin script to mark the phonemic glottal stop, as it is used in many Polynesian languages.

Use of the apostrophe and macron symbols in Samoan words was restored by the Ministry of Education in 2012 after being removed in the 1960s.

The ʻokina visually resembles a left single quotation mark—a small "6"-shaped mark above the baseline.

The Tahitian ʻeta has a distinct shape, like an ʻokina turned 90° or more clockwise.

The ʻokina is a letter in the Hawaiian alphabet. It is unicameral— that is, it does not have separate uppercase (capital) and lowercase ("small") forms— unlike the other letters, all of which are basic Latin letters. For words that begin with an ʻokina, capitalization rules affect the next letter instead: for instance, at the beginning of a sentence, the name of the letter is written "ʻOkina", with a capital O.

The United States Board on Geographic Names lists relevant place names both with and without the ʻokina and kahakō in the Geographic Names Information System. Colloquially and formally, the forms have long been used interchangeably.

In the ASCII character set, the ʻokina is typically represented by the apostrophe character ('), ASCII value 39 in decimal and 27 in hexadecimal. This character is typically rendered as a straight typewriter apostrophe, lacking the curve of the ʻokina proper. In some fonts, the ASCII apostrophe is rendered as a right single quotation mark, which is an even less satisfactory glyph for the ʻokina—essentially a 180° rotation of the correct shape.

...
Wikipedia