Qiaopi (侨批) consisted of a letter and money sent by overseas Chinese to their families back in China.[1] Remittance (qiaohui) or silver or money (pikuan) is sent together with a letter (pixin) in a single envelope.[2] This differentiates a qiaopi from other forms of correspondence such as mail. Qiaopi is sometimes referred to as zhengpi ("main pi")[1] or silver letters (yin xin 银信).[3] On certain occasions such as a notice of death, a qiaopi may simply be a letter without any money attached.[4] In such a case the qiaopi would be referred to as "baixin (a letter without money)".[4] Only in exceedingly rare occasions would a baixin contain some money.[4] In 2012, qiaopi was added to the Asia-Pacific Memory of the World Register and in 2013, it was added to the International Memory of the World Register.[5][6]