79 and preceding 81. Its ordinal form is written "eightieth" or 80th.80 (eighty) is a positive integer following
It is also the number of possible bishop moves in 4×5 minichess.
- In Greek-based number-naming systems, 80 is associated with prefix "octaconta-", and with prefix "octoginti-" in Latin systems.
- Sbiis Saibian coined the name binary-dust mite for this number.
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