The end of the file opposite to the tang is called the point, or the toe.
While it may seem strange to have the heel and the toe so far apart, remember that your own heel and toes are at opposite ends of your foot!
While ‘point’ is the most common term used for this part of the file, it is not always pointed and can be completely flat.
An easy way to remember the name is that it’s the part of the file that points towards your workpiece when in use.