Set squares are drawing instruments used to create vertical, horizontal, and diagonal lines as well as certain angles. They may be shaped as squares, Ls, or triangles, although in American usage set ...

Of course, there are diagonal haters out there. In the Reddit thread claiming that horizontal as the ideal slice, commenters rallied in the poster's defense. "Agree. I can't stand diagonal cut ...

Hairline, vertical, diagonal, horizontal and stair-step are all types of foundation cracks. Small cracks can be normal due to settling, but larger cracks that let in water are concerning.