Slide 23
Slide 23 text
Terminology
Standard terminology for tree structures is taken from the second form of
family tree, the lineal chart: Each root is said to be the father of the roots of
its subtrees, and the latter are said to be brothers, and they are sons of
their father. The root of the entire tree has no father. […] Some authors
use the feminine designations “mother, daughter, sister” instead of “father,
son, brother”; but for some reason the masculine words seem more
professional. Other authors, wishing to promote equality of the sexes use
the neutral words “parent, offspring, sibling” instead.
D. Knuth “The Art of Computer Programming” 1968