Naming Objects
You can assign a certain name to an object when you create it using the Input Bar:

Points: In GeoGebra, points are always named using upper case letters. Just type in the name (e.g. A, P) and an equal sign in front of the coordinates or commands.
C = (2, 4)
, P = (1; 180°)

Vectors: In order to distinguish between points and vectors, vectors need to have a lower case name in GeoGebra. Again, type in the name (e.g. v, u) and an equal sign in front of the coordinates or commands.
v = (1, 3)
, u = (3; 90°)

Lines, circles, and conic sections: These objects can be named by typing in the name and a colon in front of their equations or commands.
g: y = x + 3
, c: (x1)^2 + (y – 2)^2 = 4
, hyp: x^2 – y^2 = 2

Functions: You can name functions by typing, for example,
f(x) =
org(x) =
in front of the function’s equation or commands.
h(x) = 2 x + 4
, q(x) = x^2, trig(x) = sin(x)

Reserved labels
These are the labels you can’t use for objects: x, y, z, xAxis, yAxis, zAxis, abs, sgn, sqrt, exp, log, ln, ld, lg, cos, sin, tan, acos, arcos, arccos, asin, arcsin, atan, arctan, cosh, sinh, tanh, acosh, arcosh, arccosh, asinh, arcsinh, atanh, arctanh, atan2, erf, floor, ceil, round, random, conjugate, arg, gamma, gammaRegularized, beta, betaRegularized, sec, csc, cosec, cot, sech, csch, coth
In the symbol list of the Input Bar, you will find special characters for the following constants:

π  the circle constant pi, which you can also type with Alt + p

ℯ  the Euler number, e.g. for the exponential function ℯ^x, which you can also type with Alt + e

ί  the imaginary unit, e.g. for complex numbers like z = 3 + ί, which you can also type with Alt
i
When the variable names e and i are not used yet, they are automatically read as ℯ and ί respectively for convenience.
Renaming objects
The easiest way to change the name of an existing object is to select it, then start typing its new name.
You can also rename an object by then selecting the Rename option in the Context Menu of the object or opening the Properties Dialog window of the object and typing the new name in the Name box of the Basic tab.

See also Labels and Captions.