ambigram: 1.january
ambigram: 1.january
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New Year? ("The Julian calendar began on January 1, but the Christian Church frowned on pagan celebrations of this and chose the Feast of the Annunciation (March 25) as its New Year's Day" - http://www.etymonline.com/index.php?term=New+Year%27s+Eve).

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'January' is 'the month of Janus', the deity famous for depicting two faces, one in front, the other at the back (ooh, very ambigramesque!).