FOAK

FOAK is an acronym for First of a Kind. It is used in engineering economics where the first item or generation of items using a new technology or design can cost significantly more than later items or generations, which are called NOAK an acronym for nth of a kind.{{Cite web|url=https://www.abbreviations.com/term/1516384/nth-of-a-kind|title = NOAK - NTH of a Kind}}