German term (edited): mit Winkelkaro

Examples in German
https://www.marketer-shop.de/epages/61127043.sf/de_DE/?Objec...
https://www.neumann-werbetechnik.de/sodcms_Notizbuch_bedruck...
https://www.egs-werbemittel.de/notizbuch-copy-book-a5-geprae...
https://www.deprismedia.com/digital-und-offsetdruck/notizbue...

The last of these also provides an English 'translation' — namely "with angled check" — that is too literal, not at all idiomatic, and not at all recommended by me
https://www.deprismedia.com/digital-and-offset-printing/note...

For mathematical applications this could be seen as a type of "graph paper", although when I think of "graph paper" I tend to envisage a finer spacing between lines (about 1 to 2 mm spacing)
http://print-graph-paper.com/
For mathematical applications with a coarser spacing one might use the term "grid paper"...
https://www.waterproofpaper.com/graph-paper/grid-paper.shtml
...and here it is used in the context of generic applications too:
https://milligram.com/leuchtturm1917-medium-notebook-grid-a5...

This extends also to the phrase "grid notebook", etc.
https://www.fallindesign.com/grid-notebooks/

However, for generic applications including writing, sketching, accounting and so on, I would go with the term "gridded".
With a quick search, this may not be the most popular phrasing, but it certainly is used.
https://simplycharlottemason.com/store/gridded-math-notebook...
https://dynamic-stationery.com/index.php?route=product/categ...

Having looked up one stationery shop, they use the phrase "[with a] grid ruling".

Finally, following the above phrase one can also get "grid-ruled", although it seems to be relatively uncommon
http://nymag.com/strategist/article/best-notebooks-lined-gri...
http://www.bookfactory.com/grid_notebooks/grid_notebooks.htm...

--------------------------------------------------
Note added at 19 days (2019-07-03 00:58:54 GMT)
--------------------------------------------------

You could also add "square" into the expression to obtain
"with square grid" ...
https://www.amazon.com/Graph-Paper-Notebook-8-5-Quadrille/dp...

...or "with grid squares".
https://standardbindery.com.au/products/md-paper-notebook-b6...

The terms "quad-ruled" and "quadrille" also appear...
https://www.amazon.com/Graph-Paper-Notebook-8-5-Quadrille/dp...
https://www.staples.com/Quad-Notebooks-Pads/cat_CL165557/7hl...
https://www.wisegeek.com/what-is-quadrille-paper.htm

...but they may connote a specific spacing between lines, namely ¼-inch squares, i.e. 4 squares per inch.
https://www.amazon.com/Graph-Paper-Inch-Squares-Composition/...