XO

XO is a two-letter designation used in a variety of contexts, from beverages and condiments to military and popular culture. Because its meaning depends on context, it is not tied to a single topic.

In cognac labeling, X.O. stands for Extra Old. The designation signals substantial aging; under contemporary regulations, the youngest spirit in an X.O. blend must be aged at least 10 years, with some expressions older. The label implies depth and complexity, though actual ages vary by producer.

XO sauce is a premium Cantonese condiment developed in Hong Kong during the 1980s. It typically combines dried scallops, shrimp, chili peppers, garlic, and oil to create a savory, aromatic sauce used as a flavoring for seafood, stir-fries, and dim sum. Its name evokes luxury, echoing the cognac term, but it is a distinct product.

In military contexts, XO is the abbreviation for executive officer, the second-in-command on a ship or squadron. In popular culture and business, XO is the name of a record label and brand associated with the Canadian artist The Weeknd. In genetics, X0 or XO is used to denote monosomy X, a chromosomal variant associated with Turner syndrome.

In casual communication, XOXO is a common sign-off meaning hugs and kisses.