More than 80 such signs were placed around the country's coastline during the conflict to prevent bombers who might otherwise have thought they were flying over the UK.
A Garda air support unit crew noticed the sign earlier today following a fire that had spread throughout Bray Head.
A fire in Bray has uncovered a hidden EIRE sign that dates back to the Second World War and had been previously lost to the ages..
The gorse fire has been burning in the area for the past three weeks, but the sign was only revealed when the smoke cleared.
Numerous signs, which were carved into headlands for both Allied and German pilots, are still visible and have been restored by volunteers in recent years.
The huge letters spell the word Éire, which means Ireland in Gaelic.
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When Ireland became adopted a new constitution in 1937, it adopted the official name as Eire, and the name was used in both Great Britain and the republic.
The Defence Forces Air Corps noticed the landmark from above while assisting emergency services as they put the fire out.
The Irish Air Corps says the Bray Head sign was No. 8.
A spokesperson said "The signs themselves are quite common on the west coast but unusual on the east".
At the request of the United States air force the number of the nearby lookout post was added, turning the signs into air navigation aids.