because voltage is the 'electrical potential difference'. since a "difference" can only be evaluated between two points so is voltage :)
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It is simply called the distance between the two points - simple as that. How that distance is measured will depend on the nature of the surface on which the two points are located as well as on the metric for measuring distance that is defined on that space.The common metric in Euclidean space is the Pythagorean distance while on the surface of a sphere (like the Earth, for example), distances are measured along the great arc.
the voltage between 1 line & phase =120v The voltage between 2 line =240
A line segment is between two end points
For example, on a number line (which is one dimensional object), we measure the distance of two points in units. For example, the distance between 2 and 4 is 2 units. Any nth side of a polygon, can be measured by using linear units, such as cm, in., ft, km, etc. The circumference of a circle, the length of an arc, also are measured by linear units. A unit that is used to measure the distance between two points, is called linear dimension.
the distance between two points is length