Colored pencils and crayons called "magenta" are usually colored the color of "process magenta" ("printer's magenta") shown above. Magenta is a common color for flowers, particularly in the tropics and sub-tropics. Because magenta is the complementary color of green, magenta flowers have the highest contrast with the green foliage, and therefore are more visible to the animals needed for their pollination. The German telecommunications company Deutsche Telekom uses a magenta logo. It has sought to prevent use of any similar color by other businesses, even those in unrelated fields, such as the insurance company Lemonade. Magenta was the English name of Tokyo's Oedo subway line color. It was later alternated to "ruby". In aircraft autopilot systems, the path that pilot or plane should follow to its destination is usually indicated in cockpit displays using the color magenta. The Reserve Bank of India (RBI) issued a Magenta coloured banknote of ₹2000 denomination on 8 November 2016 under Mahatma Gandhi New Series. This is the highest currency note printed by RBI that is in active circulation in India. Magenta is an extremely rare colour to find on heraldic flags and coats of arms, since its adoption dates back to relatively recent times. However, there are some examples of its use: