Sombrero is the visiting card of which country?

In English, a sombrero is a type of wide-brimmed Mexican men's hat used to shield the face and eyes from the sun. It usually has a high, pointed crown; an extra-wide brim (broad enough to cast a shadow over the head, neck, and shoulders of the wearer) that is slightly upturned at the edge; and a chin strap to hold it in place.

In Mexico, this hat type is known as a sombrero de charro ("charro hat", referring to the traditional Mexican horsemen).

Sombreros, like cowboy hats, were designed in response to the demands of the physical environment. The concept of a broad-brimmed hat worn by a rider on horseback can be seen as far back as the Mongolian horsemen of the 13th century, and in the Greek petasos two millennia before that. In hot, sunny climates hats often have evolved wide brims. The exact origin of the Mexican sombrero is unknown, but it is usually accepted that the hat originated with mestizo cowboys in Central Mexico. Although sombrero is usually taken to refer to the traditional Mexican headwear, the term sombrero predates this item of clothing, and has been applied to several differing styles of hat. Other types of hats known as sombrero can be found in South America and Spain, including the sombrero calañés, sombrero cordobés and sombrero de catite (Spain), and sombrero vueltiao (Colombia).