The Xin Hua Online Dictionary explains that the bottom is the handle, the top is the blade. I would say that the top may be the handle, the right bottom is the blade, and left bottom is used by ancient Chinese which we don't understand.
Its small seal script is
which is not like knife anymore, dictionary says that the change had been made too much. But if we consider the top is the handle, it is still like a knife, even though not a good pictography.
Its clerical script is
some similarity to small seal script, but not like knife very much.
Its current standard printing script for traditional or simplified character is
same as the clerical script.
Its Pinyin is "Dao1".