Dyluniwyd y llythrennau mawr 'EPIC' gan asiantaeth greadigol Croeso Cymru, Smorgasbord, ac maent wedi'u creu gan Wild Creations, y cwmni o Gaerdydd a greodd y 'Bêl yn y Wal' yng Nghastell Caerdydd ar gyfer Cwpan Rygbi'r Byd 2015.
Designed by Visit Wales’s creative agency, Smorgasbord, the EPIC letters have been made by Wild Creations, the Cardiff-based company that created the ‘Ball in the Wall’ at Cardiff castle for the 2015 Rugby World Cup.