Teru teru bōzu
てるてる坊主 (shiny-shiny Buddhist priest) is a little traditional hand-made doll made of white paper or cloth that Japanese farmers began hanging outside of their window by a string. This amulet is supposed to have magical powers to bring good weather and to stop or prevent a rainy day. "Teru" is a Japanese verb which describes sunshine, and a "bōzu" is a Buddhist monk (compare the word bonze), or in modern slang, "bald-headed."
Teru teru bōzu became popular during the Edo period among urban dwellers, whose children would make them the day before the good weather was desired and chant "Fine-weather priest, please let the weather be good tomorrow."