The Irish Gaelic alphabet includes 5 vowels: a, e, i, o, u. Each vowel can appear in short or long form, with the long form marked by a fada (acute accent): á, é, í, ó, ú. The fada changes both the length and often the quality of the vowel sound, making it essential for correct pronunciation and meaning.
The Irish Gaelic alphabet contains 13 consonants: b, c, d, f, g, h, l, m, n, p, r, s, t. Irish consonants can be either broad (caol) or slender (leathan), depending on the surrounding vowels.
This follows the caol le caol, leathan le leathan rule (slender with slender, broad with broad).
For example:
In the word "bó", meaning "cow", the consonant b is broad because it is followed by the broad vowel ó. In the word "bí" (be), the consonant b is slender because it is followed by the slender vowel í.
Irish Gaelic uses fada marks (acute accents) on all five vowels: á, é, í, ó, ú to indicate long vowel sounds. The fada is crucial in Irish because it distinguishes between different words and meanings. For example, "cáca" (cake) versus "caca" (faeces), or "fear" (man) versus "féar" (grass).
The word "fada" itself means "long" in Irish, referring to the lengthening of the vowel sound.
Irish Gaelic uses the standard Arabic numerals 0–9, with Irish number names: náid (0), aon (1), dó (2), trí (3), ceathair (4), cúig (5), sé (6), seacht (7), ocht (8), naoi (9).
Irish has both cardinal numbers (for counting) and a complex system of vigesimal (base-20) counting traditionally used, though the decimal system is more common today.
Irish Gaelic uses standard punctuation marks including period (ponc), comma (camóg), question mark (comhartha ceiste), exclamation mark (uaillbhreac), hyphen (fleiscín), and apostrophe (uaschamóg).
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