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What is Feature of a NiTi ﬁle that a surface project axially from the central core to the cutting edge between the ﬂutes is known as: and explain in detail?
Land:
It is the area between the flutes which projects axially from central core to the cutting edge.
Rake angle:
It is the angle formed by leading-edge with the radius of file. Acute angle is considered as a negative rake angle and obtuse angle is  considered as a positive rake angle.
Taper:
It signifies per millimeter increase in file diameter from the tip towards handle of file.
Pitch:
It is the distance between two cutting edges. A file with short pitch has more flutes when compared to file with longer pitch.