Perhaps you are thinking of the straight shorter blade that ninjas used against the samurai katana? That is the ninjaken, or ninja sword, obviously a technical term in japenese :P. The ninja would have the same length sheaths as the traditional katana, that way with the shorter blade they could draw it fractionally faster, and thusly surprise and kill the unsuspecting samurai.
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shape with 2 edge is not possible
yes or it can be called a straight line
A straight edge
It is called a straight away answer given to a rhetorical question.
A dodecagon.