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Lines converging to a single point.
Also known as: Twin notation chart, Sibship twin marking
The pedigree chart notation showing twins, with their symbols joined to one point on the sibship line.
Shows twins on a pedigree chart by joining their symbols to a single point.
Contexts: Laboratory
Adds a bar between the two lines where the twins are identical, so a chart distinguishes shared genetics from shared birth by one extra stroke.
Contexts: Laboratory
Two lines descending from a single point on the sibship line, with a horizontal bar between them where the twins are identical.