Transformation of text#Upside-down text
Only some characters there are in the normal ASCII character set to 180 ° correspondences (b / q, d / p, n / u and 6/ 9), very few are even rotational symmetry and must not be changed ( z, s, x, o, 0, and 8). The remaining characters one makes do with either Unicode characters, particularly those of the International Phonetic Alphabet (for example, w → ʍ ) or with only about similar characters (eg, USD -Encoding, w → m).