Keywords: boundary, border
Sign Definition
As a Noun
                                            1.  An imaginary line or a real barrier (such as a fence) that separates one area of land from another. English = boundary.
                                          
                                          
                                        
                                            2.  The dividing line between two countries or regions. English = border.
                                          
                                          
                                         
                  
                      