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.

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'.

The first Gaelic typeface was designed in 1571 for a catechism commissioned by Elizabeth I to help attempt to convert the Irish Catholic population to Anglicanism.

Edward Lhuyd's grammar of the Cornish language used Gaelic-script consonants to indicate sounds like [ð] and [θ].

Other Irish companies that have used Gaelic script in their logos including the GAA, Telecom Éireann and An Post.

The logo more strongly shows the more widely used acronym GAA but taking a closer look a C joins with an L and then to a G lying down.