This is the main tabloid new source in Sigil.
All manner of news gets published, a lot of it pure speculation, rumours, and sometimes donwnright lies.
Its headquarters is usually located in Under Sigil, although sometimes it has to move in the face of clamp downs by the law or in rare cases angry mobs or a visit by the Fated to collect taxes, and sometimes when they have earned the ire of powerful people in Sigil.
It is represent in game by some mechanics, more information can be found here: SIGIS