viðskiptavinarins
viðskiptavinarins is an Icelandic term that translates to "the customer's" or "of the customer." It is a possessive form of the word "viðskiptavinur," which means "customer." In Icelandic grammar, the genitive case is used to indicate possession, and viðskiptavinarins is the genitive singular form of this noun.
The phrase itself would typically be used in contexts where ownership or a relationship to a customer