 Due to this one hypothesis states that "flower holes" were added to Chinese cash coins to signify a year or period of the year or possibly a location where a cash coin was produced.It is also possible that these "flower holes" and "turtle shell holes" functioned as Chinese numismatic charms, this is because the number 8 (八, "bā") is a homophonic pun in Mandarin Chinese with "to prosper" or "wealth" (發財, "fā cái"), while the number 6 (六, "liù") is a Mandarin Chinese homophonic pun with "prosperity" (祿, "lù").Concurrently the Mandarin Chinese word for as "chestnut" (栗子, "lì zi") as in the term "chestnut holes" could be a homophonic pun in Mandarin Chinese with the phrase "establishing sons" (立子, "lì zi"), which expresses a desire to produce male offspring.