Final answer:
The term from the Greek letter 'iota' meaning to write something quickly is 'jot'. 'Jot' indicates writing down a small amount quickly, reflecting the minimalistic nature implied by 'iota' in Greek.
Step-by-step explanation:
The term meaning "to mark or write quickly" that comes from the Greek letter "iota" is: a) Jot. The expression "to jot down" implies quickly making brief notes or marks, capturing essential information without extensive detail. The word "jot" has its etymological roots in the Greek letter "iota," the smallest letter in the Greek alphabet. Over time, the phrase "not one jot or tittle" has been used to emphasize the smallest details or elements. "Jot" has become synonymous with a quick, minimal notation, and it perfectly encapsulates the act of marking or writing down something briefly and swiftly.