In electronics and computing, the number of inputs to logic gates or devices that a single output can drive, or the spreading pattern of something from a central point.
Compound of 'fan' + 'out,' created in technical jargon as electronic devices became more complex and engineers needed precise terminology for circuit capabilities.
Fanout is a constraint that Silicon Valley engineers constantly worry about—if one chip output tries to power too many inputs, it 'sags' and fails, which is why computer chips have buffers and repeaters, invisible complexity that keeps your device working.
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