Type Command
 Type( <Object> )

For conics and quadrics this command returns a number representing the conic/quadric type according to the table below. In this context, an empty conic (or quadric) is one whose coefficients are defined, but that does not contain any real point, e.g. x^{2} + y^{2} = 1. For conics, GeoGebra distinguishes double line (special case of parallel lines with distance 0) and single line (special case of circle with infinite diameter, may result from circle inversion). For quadrics there is no such distinction.
Type(x²+y²=1)
yields 4 which stands for circle.
Value  Type of conic  Type of quadric 

1 
Single point 
Single point 
2 
Intersecting lines 

3 
Ellipse 
Ellipsoid 
4 
Circle 
Sphere 
5 
Hyperbola 

6 
Empty 
Empty 
7 
Double line 

8 
Parallel lines 

9 
Parabola 
Paraboloid 
10 
Line 
Line 
30 
Cone 

31 
Cylinder 

33 
Plane 

34 
Parallel planes 

35 
Intersecting planes 

36 
Hyperboloid of one sheet 

37 
Hyperboloid of two sheets 

38 
Parabolic cylinder 

39 
Hyperbolic cylinder 

40 
Hyperbolic paraboloid 