20 euro note about two years before it is replaced due to wear. It is the third-smallest note, measuring 133 x 72 mm with a blue colour scheme. The twenty euro banknotes depict bridges and arches/doorways in Gothic architecture (between the 13th and 14th century CE). The twenty euro note contains several complex security features such as watermarks, invisible ink, holograms and microprinting that document its authenticity. The full design of the Europa series 20 euro banknote was revealed on 24 February 2015 and launched on 25 November 2015. The euro was founded on 1 January 1999, when it became the currency of
Bulgaria and the euro banknotes. The second series of notes (beginning with the €5 note issued from 2013) includes the term "ЕВРО" and the abbreviation "ЕЦБ" (short for "Европейска централна банка", the Bulgarian name of the European Central Bank). The first series had only the standard Latin alphabet "EURO" and the Greek "ΕΥΡΩ". The euro coins only have the Latin "EURO" on their common side. Greek coins include the alternative Greek spelling on the national (obverse) side. Bulgarian coins, therefore, may follow suit, having "EURO" on one side and "ЕВРО" on the other. The plural of евро in Bulgarian varies in spoken language –