Commands
From GeoGebra Manual
Using commands you can produce new and modify existing objects.
Note: A command's result may be named by entering a label followed by an equal sign (=). In the example below, the new point is named S.
Example: To get the intersection point of two lines g and h you can enter
S = Intersect[g, h]
(see Intersect Command). Note: You can also use indices within the names of objects: A1 is entered as
A_1
while SAB is created using s_{AB}
. This is part of LaTeX syntax.