I don’t have to even tell you the most common mistake found on U. It rears its ugly head on hand-lettered sandwich boards the world over.

The notorious double-thick U. It is as prevalent as it is hideous. It will never die—only regenerate in a slightly different form.

Hundreds of years of tradition says that (in typefaces with normal contrast), the right side of U is treated as a thin.

Respecting that tradition aids in legibility, as most folks have been reading Us with contrast their whole lives.

In some classical designs, uppercase U takes a form very similar to the lowercase. We even see this on the Trajan Column.

In sans land, the u is just an upside down n. Isn’t that crazy?

But in the serif form, we see that u is no longer an upside-down n.

That’s all I feel compelled to say about u. It is a humble little creature. Respect it, and it will respect u.