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A zigzag is a pattern made up of small corners at variable angles, though constant within the zigzag, tracing a path between two parallel lines; it can be described as both jagged and fairly regular. From the point of view of symmetry, a regular zigzag can be generated from a simple motif like a line segment by repeated application of a glide reflection. File:Regular apeirogon zig-zag.png The origin of the word is unclear. Its first printed appearance was in French books in the late 17th century.〔(Google Books: "Word Origins and how we know them" )〕 ==Examples of zigzags== Lightning and other electrical hazards are often depicted with a zigzag design, with long downward strokes and short backward ones. The trace of a triangle wave or a sawtooth wave is a zigzag. Pinking shears are designed to cut cloth or paper with a zigzag edge, to lessen fraying. A carpenter's folding ruler is a zigzag. Zigzags are a basic decorative pattern used on pottery, and are often seen in the cuts which separate pieces of ravioli pasta. In sewing, a ''zigzag stitch'' is a machine stitch in a zigzag pattern. The zigzag arch is an architectural embellishment used in Islamic, Byzantine, Norman and Romanesque architecture. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Zigzag」の詳細全文を読む スポンサード リンク
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