It depends on which alphabet you are talking about. The Latin alphabet for English has 11 upper case curved letters (BCDGJOPQRSU) and 18 lower case curved letters (abcdefghjmnopqrstu)
It's just called curved glass.
The curved bones of the chest is called ribs
A curved saber is called a mameluke.
ogee is curved molding
It called the curved surface area. There is no special name for it.
It called the curved surface area. There is no special name for it.
The curved path is called a trajectory
It is called a "meander". They are the curved parts in a stream.
The curved path is called projectile motion.
The curved part of a saddle is called the "seat."
An arch