Nothing, thats all made up. 3 consecutive lines mean nothing and whoever told you they might have a meaning is probably a loon or trying to get money off you.
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In a fetal ultrasound, it indicates that the gender of the baby is a girl (I think).
Concurrent lines or line segments occur when 3 or more lines meet at the same point
only 1 lines can contain 3 collinear points. Maybe you mean coplanar?
A triangle? Three lines that intersect in three points.
An equilateral triangle has exactly 3 lines of symmetry.