English: Sofia metro lines are marked with these symbols: the metro's logo in dark blue, enclosed in a dark bluw circle, followed by a solid fill circle with the line colour and the line number in it. M1 line is dark red in all maps and station signage.
Български: Линиите на Софийското метро се отбелязват с тези символи: тъмносиня версия на логото на метрото, оградено от тъмносин кръг, следван от кръг с цвета на линията и номерът ѝ. Линия М1 е отбелязана с тъмно червено на всички карти и табели в метрото.
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