In Japan, 39 can become “thank you,” because three can be read as san and nine as kyū. The number 1122 can be read as ii fūfu, “a good married couple.” This kind of number wordplay, known as goroawase, is less about reading numbers correctly and more about turning them into sounds that resemble other words.
Japanese numbers often have several possible readings. One can be ichi or hito, while four can be shi, yon, or yo. The system is flexible enough to borrow sounds from English too, which is why 39 can become sankyū, sounding like “thank you.” The match does not have to be perfect. If people can see how the sounds connect, a slightly forced reading is usually accepted as part of the wordplay.
Japanese people cannot automatically decode every number they see. Familiar combinations such as 1122 are easy to recognize, and some wordplays are obvious once you hear them. Others make little sense until someone explains them. There is no single hidden answer waiting inside every number.
Goroawase has also been used to memorize historical dates. A well-known example is 794, remembered through the phrase naku yo uguisu Heian-kyō, roughly “the bush warbler sings, Heian-kyō.” Turning a date into a phrase makes it much easier to remember than memorizing four digits on their own.
The same idea appears in unofficial commemorative days. November 22 is known as “Good Couple Day” because 11 can suggest ii, “good,” and 22 can be read as fūfu, “married couple.” Even if the connection is a little forced, it does not feel unusual as long as the wordplay makes sense.
It can also be practical. Businesses have long used memorable number combinations in telephone numbers, especially when the sounds relate to what they sell or do. People also choose meaningful combinations for personalized license plates, so number wordplay is not used only as a memory aid.
Its practical role has changed, though. In the past, getting customers to remember a company’s telephone number mattered much more. Today, most people can simply search for the business online and find the number in seconds. Goroawase is still widely used, but its old job of making telephone numbers stick in people’s heads is not nearly as important as it once was.