A golf club
That's called the green.
you hit the ball towards the flag. But if it goes in a water hazard, you drop before the water.
An air shot.
When Armstrong landed on the moon in 1969 he placed a flag, collected moon rocks, and used a golf club to hit a ball.
The "Pin" is the flag stick onto which the flag is attached.
a hole in one
The three flag system encourages slower groups to keep position and pace on golf course.
I am assuming you mean when you are on the green. In which case it is a two shot penalty and you play the ball as it lies.
Aja Lily EllsworthHalloway did, in 1657. She was walking around with walking stick and found a large fruit shaped like a ball and stuck the stick in it the found another on of those fruits and hit like a golf club would today. She called it hit the ball with the stick and fruit (she called the golf club which she didn't know what is was then a sticking club and she called her so called game hit the fruit. then later on around 1982, it was called golfing, and the tool used for golfing is what we call now a golf club.