Picocon is the name given to a series of British science fiction conventions run by the Imperial College Science Fiction and Fantasy Society (ICSF),. Taking place usually on a Saturday, in February or early March in Imperial College's Blackett Building since 1984. T-shirts and other merchandise related to the convention are typically emblazoned with the Greek letters ΨΦ (psi, phi), which can be read as Sci-Fi. Roles in organising the convention include the Sofa ("like a chair, only comfier") and the Beanbag.