fanout

fan +‎ out, from the phrasal verb.

fanout (countable and uncountable, plural fanouts)

1. (computing, electronics) The degree to which something fans out, or splits into separate sections.

   B+ trees have very high fanout, which reduces the number of I/O operations required to find an element in the tree.

   The fanout of a logic gate output is the number of gate inputs to which it is connected.

• fanin

• Tufano