In this context, the two factors involved are sometimes spoken of as something you have and something you know. A common example of two-factor authentication is a bank card: the card itself is the physical item and the personal identification number (PIN) is the data that goes with it.
The 49ers would become the second best team in the league until it dissolved after the 49ers first season, and they joined the NFL ranks along with the Cleveland Browns and the Baltimore Colts. The San Francisco 49ers get their name from the California gold-seekers who stampeded the area in 1849.
How did Mars get its name? Quick Answer. Because of their militant nature, the Romans named the brightest red point of light in the night sky after their patron god of war. It only makes sense to give him a place of honor then, but Mars has had many names throughout the course of human civilization.