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Conventions commonly encountered in human pedigrees

Description
O Female [I Male <> Sex unknown
. I Affected individuals
0-D Parents (unrelated)
04:] Consanguineous parents (related)
m Offspring (in birth order)
1 2 3 4
db Fraternal (dizygotic) twins
(sex may be the same or different)
0?) Identical (monozygotic) twins
(sex must be the same)
El Qt) Multiple individuals (unaffected)
I
P/ Proband (in this case, a male)
Q Deceased individual (in this case, a female)
Q E] Heterozygous carriers
I, II, III, etc. Successive generations
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