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2. Tree (graph theory) - Wikipedia

   en.wikipedia.org/wiki/Tree_(graph_theory)

   Counting the number of unlabeled free trees is a harder problem. No closed formula for the number t(n) of trees with n vertices up to graph isomorphism is known. The first few values of t(n) are 1, 1, 1, 1, 2, 3, 6, 11, 23, 47, 106, 235, 551, 1301, 3159, … (sequence A000055 in the OEIS). Otter (1948) proved the asymptotic estimate

3. Typeface anatomy - Wikipedia

   en.wikipedia.org/wiki/Typeface_anatomy

   [5] A main vertical stroke is a stem. The letter m has three, the left, middle, and right stems. The central stroke of an s is known as the spine. [6] When the stroke is part of a lowercase [4] and rises above the height of an x (the x height), it is known as an ascender. [7] Letters with ascenders are b d f h k l.

4. m-ary tree - Wikipedia

   en.wikipedia.org/wiki/M-ary_tree

   For an m-ary tree with height h, the upper bound for the maximum number of leaves is . The height h of an m-ary tree does not include the root node, with a tree containing only a root node having a height of 0. The height of a tree is equal to the maximum depth D of any node in the tree.

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7. Counter (typography) - Wikipedia

   en.wikipedia.org/wiki/Counter_(typography)

   Storey refers to the number of open or closed stacked counters, especially in the context of the letters a and g and their typographic variants.. The lowercase 'g' has two typographic variants: the single-storey form (with a hook tail) has one closed counter and one open counter (and hence one aperture); the double-storey form (with a loop tail) has two closed counters.