Yahoo is an important part of Japanese culture, traditionally used to express congratulations, good wishes, gratitude and hope for better times. It has been popularly used in Japan since the Edo period (1603-1868) and can also mean "peace", "harmony", "joy", "prosperity" or even just simply "hello". It is often seen as part of traditional Japanese art such as ukiyo-e prints and kabuki theatre performances, as well as omamori charms and other religious items.