Traverse terminology — the distance between two terminal points obtained from a subsidiary traverse run between them is commonly called:

Introduction / Context:
When direct measurement of a long line is impractical, surveyors often run a subsidiary (tie) traverse between the terminal points to compute the straight-line distance. The specific term for this computed connection clarifies communication in field notes and reports.

Given Data / Assumptions:

• Two terminal points require a reliable connecting distance.
• A subsidiary traverse with checks is feasible.
• Computed distance substitutes for a direct measure.

Concept / Approach:
A traverse base is the straight-line distance between terminals as determined from a subsidiary traverse. It functions like a base line for subsequent work or as a control check on the main traverse. While "base" is generic, "traverse base" specifies that it was obtained via a traverse solution rather than direct chaining or EDM.

Step-by-Step Solution:

Verification / Alternative check:
Agreement with an eventual direct measurement or independent tie affirms the reliability of the traverse base.

Why Other Options Are Wrong:

• Traverse leg: Refers to a single side of a traverse, not the computed terminal distance.
• A base: Too general; lacks the traverse origin specificity.
• All of the above: Only one term is precise.

Common Pitfalls:
Not distinguishing between a direct base line and a traverse-derived base; documentation should state the method.

Final Answer:
Traverse base