Characteristics
Besides the 26 letters of the Latin alphabet, Gaelic typefaces must include all vowels with acute accents (Áá Éé Íí Óó Úú) as well as a set of consonants with dot above (Ḃḃ Ċċ Ḋḋ Ḟḟ Ġġ Ṁṁ Ṗṗ Ṡṡ Ṫṫ), and the Tironian sign et "⁊", used for agus 'and' in Irish. Gaelic typefaces also often include insular forms of the letters s and r, and some of them contain a number of ligatures used in earlier Gaelic typography and deriving from the manuscript tradition. Lower-case i is drawn without a dot (though it is not the Turkish dotless ı), and the letters d, f, g, and t have insular shapes. Many modern Gaelic typefaces include Gaelic letterforms for the letters j, k, q, v, w, x, y, and z, and typically provide support for at least the vowels of the other Celtic languages. They also distinguish between & and ⁊ (as did traditional typography), though some modern fonts replace the ampersand with the Tironian note ostensibly because both mean 'and'.
Read more about this topic: Gaelic Type