457: Ambigram Mar 9, 2016

An ambigram is a word written such that when it's turned upside-down, reads the same word. However cool that idea is, it's not a linguistic feature of words in any language, because it relies on fonts. Depending on the font, 'swims' could be an ambigram, or it could not be; ambigrams are largely if not entirely dependent on the script, and shape of the letters.