Flagging tape can be used to mark and identify areas of a job site, which may be needed for any number of reasons.  Flagging is used in surveying to mark grade levels, utility lines, survey stakes and other boundary markers.

It comes in a variety of colors and 1” or 1-3/16” width.

https://www.keson.com/products/flagging-tape/

https://www.keson.com/products/barricade-tape/