Question

what is plunb line. How it looks like.

Answer 1

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Definition of plumb line 

1: a line (as of cord) that has at one end a weight (such as a plumb bob) and is used especially to determine verticality

2: a line directed to the center of gravity of the earth : a vertical line

Examples of plumb line in a Sentence.

Then gently unroll the paper strips onto the wall, working your way from top to bottom, and keeping the edge of the paper aligned with the plumb line.— Daniel Bortz, sacbee, "Four home-improvement jobs you can knock out," 15 June 2018My father’s simple existence has been like a horizontal plumb line for me, one to gauge myself against.— R. Daniel Foster, WSJ, "A Father’s Lesson: Keep the Spirit Level," 14 June 2018.


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Answer 2

: a line (as of cord) that has at one end a weight (such as a plumb bob) and is used especially to determine verticality.
The instrument has been used since at least the time of ancient Egypt to ensure that constructions are "plumb", or vertical. It is also used in surveying, to establish the nadir with respect to gravity of a point in space. It is used with a variety of instruments (including levels, theodolites, and steel tapes) to set the instrument exactly over a fixed survey markeror to transcribe positions onto the ground for placing a marker.