[Answer] This famous sign is used to denote stations in what city’s metro system?

Step 1 : Introduction to the question "This famous sign is used to denote stations in what city’s metro system?"

...The red, white, and blue station signs — circular discs called roundels — used for London’s Underground (aka the Tube) were created by Edward Johnston in 1919. Prior to Johnston’s design, various roundels were used, but his design united all the signs for London’s Underground system and became emblematic of the city.

Step 2 : Answer to the question "This famous sign is used to denote stations in what city’s metro system?"

London:

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