Students caught using the local dialect had to hang a ‘‘dialect card’’ (a tag made of wood or paper) around their necks. They could pass the card on to another student if they caught them using the local dialect.
Photograph: a dialect card at Kihoin Shushukan Museum, Taketomi Island (height: 17 cm, base: 5 cm, thickness: 9 mm).
From: ITANI, Yasuhiko. 2006. Okinawa no Hogen Fuda (The Dialect Card in Okinawa). Naha: Borderink.