Athletes wear lucky socks. Children have their favorite stuffies. But tech founders? Their most prized workplace possessions run an exceptionally wide gamut, ranging from the idiosyncratic (a Jesuit obelisk) to the alarmingly practical (a pistol lockbox) to the comfortingly basic (a yellow pad and pen). Whether a founder works from home, the office or a rotating carousel of hotel rooms, you can bet they keep something nearby that reminds them of their roots—or just gives them something to fidget with.