back slash vs. forward slash
It seems that legions of people don't understand the difference…so they mis-label the common slash.
The "common" slash has been around for decades on typewriters around the world; it's what we now must have to call a "forward slash". Because the computer age has introduced the "back slash" for use in some applications.
The common "forward" slash looks like this: /
The back slash looks like this: \
But so many people continue to mis-speak. It's an extremely critical difference when applied to Internet URLs; even though it's rarely used in these cases. When was the last time YOU saw a back slash in a URL? Probably before Moses.