Master cone doesn't reach the apex:
1- ledge
2- residual remenants (debris)
3- ......
4- 1&2 ***
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The word cone is used in many fields: biology, zoology, botany, mathematics ...
Biology:
Cones are the receptive elements of the retina for color. There are three types to capture the radiation (or stimuli) corresponding to red orange, green and blue violet, the three primaries of the additive RGB system.
Zoology:
A cone is a mollusc, a marine snail most often of the genus Conus.
Botanical:
In botany, the cone is the reproductive organ of gymnosperms (fir, sequoia, pines ...).
Geometry:
A cone is a geometric figure in the shape of an ice cream cone.
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Endodontics