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Language markers such as the above are an important element in signatures, which are the on-line world's most deliberate identity signals. The signature is added at the discretion of the user, though once designed, it is usually appended automatically to postings. It may be an electronic business card, an elaborate work of self-expression, a cryptic remark, or simply a name. Not everyone uses one, and they are far more prevalent in certain forums than others. Although the signature itself is an easy to copy conventional signal, it is often used as a means to link to more robust and reliable indicators of identity and to show writer's the affiliation with a subgroup.