The main Gaelic languages and their alphabets are:
* Irish (Gaeilge): Uses the standard Roman alphabet with the addition of three letters with diacritics: `á`, `é`, `í`, `ó`, and `ú`. These represent the pronunciation of the vowels with a length or different sound quality than their unaccented counterparts.
* Scottish Gaelic (Gàidhlig): Also uses the standard Roman alphabet with the addition of several letters with diacritics similar to Irish, including `à`, `á`, `è`, `é`, `ì`, `í`, `ò`, `ó`, `ù`, and `ú`. The specific usage and pronunciation of these can vary slightly from Irish.
* Manx (Gaelg): Similar to Irish and Scottish Gaelic, uses the Roman alphabet with diacritics, though the specific letters and their usage have some differences again.
It's important to note that the diacritics are crucial for correct spelling and pronunciation in Gaelic. Without them, the meaning of words can be significantly altered. These are not simply "optional" accents but integral parts of the letters themselves.