TNB Frame vectors

[Master J]

In vector calculus, with a space curve C, there are the 3 vectors, tangent, normal, and binormal.

Are they always considered in their UNIT form, ie., divided by their length?

[mathman]

In vector calculus, with a space curve C, there are the 3 vectors, tangent, normal, and binormal.

Are they always considered in their UNIT form, ie., divided by their length?
There is no hard and fast rule. It is simply a matter of convention.