1. Appears at first glance to be a regular "y", but upon closer inspection it contains to dots above it, which is not usual for a y in the english language. These dots give the appearance that it is somehow a deranged smiley face with it's lip hanging far below where its mouth ends.
When you instinctively look up "y" and hit enter, expecting to be brought to the YouTube home page, but are sent to "iamamiwhoami; y". This is likely due to you clearing your search history.