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
Sixteen Prefectures pad for victorious, but inconsequential attacks on the Song. Then, in 1004, Liao emperor Shengzong launched another major campaign against the Song. The Shanyuan Treaty signed in early 1005 resulted in annual tribute paid to the Liao dynasty by the Song dynasty. This treaty was the guide by which relations between the two dynasties would progress until the fall of the Liao dynasty. The Sixteen Prefectures would remain in their possession until that time. Sixteen Prefectures The Sixteen Prefectures (), more specifically the Sixteen Prefectures of Yan and Yun or the Sixteen Prefectures of You and Ji (), comprise a