Los fax. Faxes is a popular plural invented by people who never learnt of any Spanish word ended in -x and most probably modelled after the English plural with some additional influence of facsímiles being the plural of facsímil. As a general rule, words ended in -x are invariable:
el nártex - los nártex
el córtex - los córtex
These are the couple I know and remember now. Surely there are more of them.
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