article_snippet.sent: But the squiggles are actually thought to be a 'code' for crooks, giving potential housebreakers details about the building, such as whether it is a good target or has an alarm, or been targeted before successfully.
article_snippet.sent: Other marks could suggest that the occupant is vulnerable or that there is nothing inside the property worth taking.
article_snippet.sent: The shape of an open book means a vulnerable female resident is the occupant, while another symbol of interlocking squares indicates a homeowner who is 'nervous and afraid'.
highlights_snippet.sent: Other codes suggest occupant is vulnerable or that property has an alarm .
  
highlights_snippet.sent: Another mark tells burglars if there is nothing worth stealing in the building .