This is a curved mirror as it might appear from the side. This could represent either a concave or convex mirror. The difference is simply which side is the real side. With a mirror the side of the mirror you are on is the real side while the "back" side is the virtual side.
The optical axis (OA) cannot be seen but is a useful line which passes through the center of the mirror.
The apex is simply the point where the optical  axis intersects the mirror.
C is the center of curvature of the mirror.
The distance from C to the apex would be the radius of the full circle the mirror is a section of. This will be important when drawing normals.
Which type of curved mirror is shown in this diagram
Title one of your "Blank Mirror Diagrams" Concave Reflection and label it with all of this information.