In facsimile, a frequency modulationsystem where one frequency represents picture black and another frequency represents picture white[?]. Frequencies between these two limits may represent shades of gray
An intentional frequency change used for modulation purposes
... first to have the title of "Tyrant" was Pisistratus in 560 BC.
In modern times Tyrant has come to mean a dictator who rules with cruelty.
Bullying is ...