So i was browsing a well-known site, quite obvious which from the caption on the image, and it dawned on me that this road sign might not be very common or even exist at all in the US, hence the uploader not realizing that there's nothing missing and it's a correct road sign, signaling that you're at the wrong end of a one-way street. And yes, there's another sign that has the exact same meaning, composed of a full red circle with a horizontal white bar.
This got me thinking: is there an equivalent sign in the US?
I know of "one way" signs, but these seem to be at the beginning of the street in question. And there are "no [left\right] turn" signs, but putting up 3 of those at a 4-way intersection seems more costly than putting up just the one "don't come in here" sign.