Boustrophedon  is a style of writing in which alternate lines of writing are reversed, with reversed letters. This is in contrast to lines always beginning on the same side, usually the left, as in modern European languages.
The term comes from Ancient Greek: , boustroph?dón, a composite of ?, bous, "ox"; , stroph?, "turn"; and the adverbial suffix -, "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 in 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 typically written boustrophedonically.
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. When unfolded horizontally (as in the case of the stone-cut boustrophedon inscriptions), the final result is writing which starts from right to left, and continues from left to right in the next row, with letters turned upside down. Sebestyén states that the ancient boustrophedon writings were copied from such wooden sticks with cut letters, applied for epigraphic inscriptions (not recognizing the real meaning of the original wooden type).
The Hieroglyphic Luwian is read boustrophedonically, with the direction of any individual line pointing into the front[ambiguous] of the animals or body parts constituting certain hieroglyphs. However, unlike Egyptian hieroglyphs with their numerous ideograms and logograms, which show an easy directionality, the lineal direction of the text in hieroglyphic Luwian is harder to see.
A modern example of boustrophedonics is the numbering scheme of sections within survey townships in the United States and Canada. In both countries, survey townships are divided into a 6-by-6 grid of 36 sections. In the U.S. Public Land Survey System, Section 1 of a township is in the northeast corner, and the numbering proceeds boustrophedonically until Section 36 is reached in the southeast corner. Canada's Dominion Land Survey also uses boustrophedonic numbering, but starts at the southeast corner. Following a similar scheme, street numbering in the United Kingdom sometimes proceeds serially in one direction then turns back in the other (the same numbering method is used in some mainland European cities). This is in contrast to the more common method of odd and even numbers on opposite sides of the street both increasing in the same direction.
In art history, it additionally means that you read from bottom left in a series of pictures; as in the stained glass windows at Sainte-Chapelle in Paris.
The constructed language Ithkuil uses a boustrophedon script.
The code language used in The Montmaray Journals, Kernetin, is written boustrophedonically. It is a combination of Cornish and Latin and is used for secret communication.