トンボとは、印刷物の印刷範囲や断裁のライン、加工の位置を示すマークのことです。
別名トリムマークともいいます。
仕上がり位置の天地左右の中心を示しています。ノンブルを示す位置のめやすにもなります。
内側の罫線は仕上がり位置を示しています。平行している外側にある罫線は断ち落とし（塗足し）の領域を表しています。
こんなときに使用
トンボがないと断裁する位置がわからくて、正しく製本できなくなるよ！
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