In the Greek language the indeclinable word () is used as the currency's name. It was decided to use omega (ω) rather than omicron (ο) as the last letter of the word, partly because a noun ending with omicron would encourage mutability, and partly to stress the origin of the euro in the Greek word ("Eurōpē", Europe) which is also spelt with omega and it is actually written on the euro notes in Greek as . Also, the spelling (resulting in a plural ) on the notes could have confused other Europeans, who might read it as a string of Latin letters: "eypo". A plural form "evra", as if from a regular declinable neuter noun in "-o", is sometimes used in a jocular way.