What is the term for this non-paperclip technique?

Solution 1:

Here they call it, nick and fold:

• Every so often, you need to keep papers together in proper order, but a stapler or clip can't be found. This nick-and-fold technique keeps up to 15 sheets together, and requires only the use of your fingers.

(lifehacker.com)

Solution 2:

There may be other colloquial terms for this ad hoc way of keeping a few sheets of paper together, but I’ve always heard it termed dog ears or dogeared. It may be imprecise, since the diagonally folded over corner of a book page, whether by accident or design, can also be called a dog ear, but no one thought to call it “dog ear with torn tab.”