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A push pin is a fastener. As a minimum, it fastens a very visible head to a surface. Even used symbolically on e.g. Google maps. Alternately it may fasten one surface (paper) to another.
Yes, the simple machine is a lever if you look at the top of a normal playground swing.
yes
A pendulum.
A Credit Card Pin is a 4 digit number that you can use in combination with your physical card, to access your bank account from an automated teller machine (ATM).