HERE ARE TWO KNIVES I HAVE WITH THIS THREE SIDED BLADE CONFIGURATION. FLAT ON ONE SIDE AND WITH TWO SIDES MEETING IN THE MIDDLE FORMING A THICK CENTER RIDGE. THE LARGE OLDER ONE IS DEFINITELY CHINESE THE SMALLER I AM NOT SURE OF. I SUSPECT THIS IS AN OLD CHINESE FORM THAT MAY HAVE BEEN SPREAD BY CHINESE MERCHANTS AS THEY TRADED MOST EVERYWHERE. PERHAPS SOMEONE WILL HAVE A CHINESE NAME FOR THIS FORM OF BLADE. AS FAR AS I KNOW IT IS NOT A COMMON FORM.