You take my words literallyTechnically, a triangular choil notch would be a severe stress riser and could cause the blade to break there in heavy use.
In practicality, it would not be an issue unless the knife will see heavy chopping or rough use.
You can not make real triangle with sharp edges even if you want with angle grinder cut off disk ....There will be radius .......... enough I was thinking on something like this ..........