As early as 1700, printed in Europe used in medicines and cloth as a first item identification label. So, now the labels are used to mark your targets and classification of products or content, like you for your targeted keywords, it's easy to find and locate yourself and others the tools they target. Label referred to in print, most descriptions are used to identify products printed, and most of it is to bring your own adhesive on the back. But there are some printing without glue, also known as tags. Adhesive label is popular called the "sticker". Instrument calibration labels, this is required by the State (or provisions within their own province) label, the label clearly stating the details of the instrument being calibrated.