The thumbs up, OK sign, V-sign (used palm-out as a peace/victory sign), and a wave or nod to beckon someone are all understood in their standard Western senses in Ireland. The two-fingered reverse-V (back of hand facing outward) carries the same rude connotation it does in the UK and Australia, so that's worth knowing if you're American and unfamiliar with it. There is no locally distinctive gesture tradition that would cause a well-meaning visitor to accidentally offend someone.
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Try the Local Etiquette & Taboos Checker →No, the OK sign (fingertip circle with three fingers raised) is understood in its standard positive sense in Ireland and is not considered offensive. There is no Irish-specific taboo attached to it.
Yes — a V-sign made with the back of the hand facing outward is considered an offensive, vulgar gesture in Ireland, just as it is in the UK. This is mainly relevant to American visitors who may not be familiar with the distinction, since in the US the orientation rarely matters.
Beckoning with a single crooked finger can come across as curt or condescending in many social situations, but this is a general etiquette point rather than a culturally specific Irish taboo. A small wave or a nod is a more polite and universally understood way to get someone's attention.