Hawaiian alphabet not make it a letter of the alphabet. In publishing the Hawaiian Bible, they used the okina to distinguish ' ('my') from ' ('your'). It was not until 1864 that the okina became a recognized letter of the Hawaiian alphabet. As early as 1821, one of the missionaries, Hiram Bingham, was using macrons in making handwritten transcriptions of Hawaiian vowels. The macron, or "", was used to differentiate between short and long vowels. The current official Hawaiian alphabet consists of 12 letters: five vowels (A a, E e, I i, O o, U u) and seven consonants (H h, K
Phonological history of English high back vowels Old English texts). There was also a pair of back vowels of mid-height, and , written (the longer one often in modern editions). The same four vowels existed in the Middle English system. The short vowels were still spelt and , but long came to be spelt as , and as . Generally the Middle English vowels descended from the corresponding Old English ones, although there were certain alternative developments – see Phonological history of Old English#Changes leading up to Middle and Modern English. Due to Middle English open syllable lengthening, short was mostly lengthened to (an opener back vowel)