in publishing, it is important to define where a printed image appears in relation to the edges of the paper - to do so, the images can be printed on a larger sheet of paper and markers placed on the sheet to show where the corners of the paper will be
Found on http://www.archivemag.co.uk/
Marks to indicate which portions a photograph or illustration are to be used, and which are to be eliminated.
Found on http://www.encyclo.co.uk/local/21023
Limit lines drawn on a photograph or design area, designed to enhance the illustration by eliminating distracting elements or an extraneous background and establishing where the trim lines for printing will occur. Found on http://www.encyclo.co.uk/local/21134
Lines near the edges of an image indicating portions to be reproduced. Also called cut marks and tick marks. Found on https://www.encyclo.co.uk/local/20631
Markings indicating where cuts should be made e.g. to trim unwanted margins or to separate business cards.
Found on https://www.encyclo.co.uk/local/20654