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The Beijing Subway's symbol, a capital letter "G" encircling a capital letter "D" with the letter "B" silhouetted inside the letter D, was designed by Zhang Lide, a subway employee, and officially designated in April 1984. The letters B, G, and D form the abbreviation for Běijīng gāosù diànchē or "Beijing high-speed electric carriage".
Read more about this topic: Beijing Subway