supplemented by an additional letter ⠰ to mark long vowels:
Unlike print Samoan, which has a special letter ʻokina for the glottal stop, Samoan Braille uses the apostrophe ⠈, which behaves as punctuation rather than as a consonant. (See Hawaiian Braille, which has a similar setup.)
Samoan Braille has an unusual punctuation mark, a reduplication sign ⠙. This is used to indicate that a word is reduplicated, as in ⠎⠑⠛⠊⠙ segisegi "twilight".