Q. A backslash character is sometimes displayed as a Japanese Yen or Korean Won mark. When I copy a backslash character to the Clipboard, and paste it to a certain web page, it becomes a Japanese Yen or Korean Won mark. Is this a bug?

No. Depending on a font you use, a backslash character (U+005C) can be displayed as a Japanese Yen or Korean Won mark. Please read Yen and yuan sign for historical reasons.