american sign language anglosphere arnhem land australia australian aboriginal sign languages australian english banzsl boarding school british sign language cd-rom cape york cape york peninsula clarification community television in australia constructed language dialect dictionary edinburgh elizabeth steel emphasis endangered language english language far north queensland fingerspelling first language frederick j rose french sign language grammar grammatical mood indigenous australians irish sign language language language family legal recognition of sign languages list of sign languages loanword london melbourne murray river natural language new south wales new zealand sign language portmanteau proto-language queensland royal institute for deaf and blind children second language sign language south australia sydney tasmania torres strait islands victorian college for the deaf vocabulary warlpiri sign language western australia