#horn.alarm_system  an alarm device that makes a loud warning sound
  supertype:  alarm_system__alarmsystem__warning_device__warningdevice  a device that signals the occurrence of some undesirable event
  subtype:  air_horn.horn__airhorn  a pneumatic horn
  subtype:  foghorn  a warning device consisting of a horn that generates a loud low tone
     subtype:  diaphone  a foghorn that makes a signal consisting of two tones
  subtype:  klaxon__claxon  a kind of loud horn formerly used on motor vehicles
  subtype:  shofar__shophar  an ancient musical horn made from the horn of a ram; used in ancient times by the Israelites to sound a warning or a summons; used in synagogues today on solemn occasions

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