There cannot be such a shape. It is not a cylinder because a cylinder sdoes not have a rectangular face. A rectangle must be a flat face and the only flat faces in a cylinder are the circle faces. The curved face can be "opened out" into a rectangular shape but because the face is curved it cannot be rectangular.
Striking the ball squarely with the face of the putter is essential to holing the ball. However, you must know the lie of the green in order to determine your shot's direction.
No it's not legal in tournament play. The putter is not allowed to resemble any other object. Also the the putter must have a greater distance measuring from the heal to toe than it does from front to back
Many references consider a face must be a flat surface, so a cylinder would fit this.
an irregular or regular shape. flat and no arcs. at least 3 sides a smiley face inside
Faceguarding is a perfectly legal technique in the NFL and NCAA. That's not correct. NFL is perfectly legal as long as no contact as made. NCAA does not allow faceguarding, you must turn around and play the ball.
I would say on flat ground due to the face that the poles must be kept straight in order to work well
Yes. If the putter has a split grip, both grips must be circular in cross section and at least 1.5 inches apart. The top grip must be at least 5 inches long. Otherwise, if one grip is used, the normal rules apply. (Rule 6)
The Muslims must face holy Ka'abah while offering prayer.
Firstly, the number must be even. 2520 is perfectly divisible.
2. One at the top and one at the bottom. The face that is cylindrical cannot be counted as a base because it is curved - in 3D shapes the base must be flat.