Blue Sign Translator is an aid instrument for the deaf people. It uses the Bluetooth technology to 1) transmit standard messages or messages resulting from human voice and 2) to receive and playback messages in Sign Language (as a movie) or in another preferred language. In the whole world, more than seven million people have hearing problems. Many of them are completely deaf. In the USA for instance, there are more than 500, 000 deaf people. Most of them, especially those who could not learn a spoken language, will never be able to master perfectly the communication with others. Those people prefer to use the Sign Language for communicating. Sign Language is also an important part of their social integration. The importance of Sign Language interpreters is widely recognized in situations like meetings, seminaries, workshops, but also at school (in particular secondary school and university) and in those common situations where it is necessary to communicate to people at public offices. Our project aims to be an answer to Sign Language demand from deaf people,  especially in those situations where the human interpreter help is not available. The system is based on the exchange of information in text format (that we called 'Blue Sign messages' format) in order to achieve the maximum in flexibility, both to send and receive information. Our basic system architecture relies solely on two Bluetooth devices (a transmitter and a receiver) and could be integrated with existing systems or other Blue Sign systems. We have found many applications that could take advantage from Blue Sign architecture. Blue Sign messages can come from speech recognition system. They could be embedded in a PDA or in a common cellular phone. On the other side, the message can be read as a video in Sign Language (understandable by deaf people), but also as text,  eventually translated into a different language, thus facilitating the communication among people who speak different languages.