It does not. Some devices may have that on their plugs, but it’s certainly not standard.

One night when I was 14, I tried to plug in my phone charger beside my bed in the dark and was accidentally touching one of the pins when it made contact.

Fortunately, I wasn’t completing the circuit and I was electrically isolated laying on my bed, so I didn’t actually get shocked. But I did feel a buzz in my finger like you get from those prank toys that shock the victim. That’s a sensation I will never forget.

Not defending our plugs at all.