The Paris Métro (French: Métro de Paris [metʁo də paʁi]; short for Métropolitain [metʁɔpɔlitɛ̃]) is a rapid transit system in the Paris metropolitan area, France. A symbol of the city, it is known for its density within the capital's territorial limits, uniform architecture and unique entrances influenced by Art Nouveau. It is mostly underground and 226.9 kilometres (141.0 mi) long. It has 308 stations, of which 64 have transfers between lines. There are 16 lines (with an additional four under construction), numbered 1 to 14, with two lines, 3bis and 7bis, named because they started out as branches of Line 3 and Line 7 respectively. Line 1 and Line 14 are automated. Lines are identified on maps by number and colour, with the direction of travel indicated by the terminus.