Signo is a website devoted to Applied Semiotic Theories. The study of Signs, Semiotics is the primary purpose of this site and explains various semiotic theories.
M. Yang, B. Wildemuth, and G. Marchionini. MULTIMEDIA '04: Proceedings of the 12th annual ACM international conference on Multimedia, page 368--371. New York, NY, USA, ACM, (2004)
F. Nack, and W. Putz. MULTIMEDIA '01: Proceedings of the ninth ACM international conference on Multimedia, page 251--260. New York, NY, USA, ACM, (2001)
E. Oren, R. Delbru, K. Möller, M. Völkel, and S. Handschuh. Proceedings of the SemWiki2006 - From Wiki to Semantics Workshop, in conjunction with ESWC2006. Budva, Montenegro., (June 2006)