"That John of Patmos was thinking about Nero finds support in verse 13:8, which reads:
Wisdom is needed here; one who understands can calculate the number of the beast, for it is a number that stands for a person. His number is six hundred and sixty-six.
The Greek name "Nero Caesar" translated into Hebrew is NRON QSRN, which adds up to six hundred and sixty-six (666)."