Boustrophedon ˌbuːstrəˈfiːdən is a style of writing in which alternate lines of writing are reversed, with letters also written in reverse, mirror-style. This is in contrast to modern European languages, where lines always begin on the same side, usually the left.
The original term comes from βουστροφηδόν, , a composite of βοῦς, , "ox"; στροφή, , "turn"; and the adverbial suffix -δόν, -, "like, in the manner of" – that is, "like the ox turns [while plowing]". It is mostly seen in ancient manuscripts and other inscriptions. It was a common way of writing on stone in ancient Greece, becoming less and less popular throughout the Hellenistic period. Many ancient scripts, such as Etruscan, Safaitic, and Sabaean, were frequently or even typically written boustrophedon.
The wooden boards and other incised artefacts of Rapa Nui also bear a boustrophedonic script called Rongorongo, which remains undeciphered. In Rongorongo, the text in alternate lines was rotated 180 degrees rather than mirrored; this is termed reverse boustrophedon.
The reader begins at the bottom left-hand corner of a tablet, reads a line from left to right, then rotates the tablet 180 degrees to continue on the next line from left to right again. When reading one line, the lines above and below it appear upside down. However, the writing continues onto the second side of the tablet at the point where it finishes off the first, so if the first side has an odd number of lines, the second will start at the upper left-hand corner, and the direction of writing shifts to top to bottom. Larger tablets and staves may have been read without turning, if the reader were able to read upside-down.
The Hungarian folklorist Gyula Sebestyén (1864–1946) writes that ancient boustrophedon writing resembles how the Hungarian rovás-sticks of Old Hungarian script were made by shepherds. The notcher holds the wooden stick in his left hand, cutting the letters with his right hand from right to left. When the first side is complete, he flips the stick over vertically and starts to notch the opposite side in the same manner.