Seven-segment display letter to be unambiguous, merely for the words as a whole to be readable. Similar displays with fourteen or sixteen segments are available allowing less-ambiguous representations of the alphabet. Using a restricted range of letters that look like (upside-down) digits, seven-segment displays are commonly used by school children to form words and phrases using a technique known as "calculator spelling". Seven-segment display A seven-segment display (SSD), or seven-segment indicator, is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays. Seven-segment displays are widely used in digital clocks, electronic
African-American heritage of presidents of the United States Jefferson's time, a person of less than one-quarter African ancestry could be considered legally white. Later this was changed so that a person had to have at least seven-eighths European ancestry to be legally white. Jefferson's mixed-race children from his relationship with Sally Hemings, were seven-eighths white. There is ample evidence in historical records that people of mixed race were accepted as white and full citizens in communities, as they were documented as exercising the rights of citizens to bear arms and vote. Social acceptance by the majority-white community was often the key as to whether a person was considered