Trilinear Polar
Given a Triangle Center 
, the line
is called the trilinear polar of
and is denoted 
.See also Chasles's Polars Theorem- Giuga Sequence
- Glaisher-Kinkelin Constant
- Glide
- Glissette
- Global C(G;T) Theorem
- Global Extremum
- Global Maximum
- Global Minimum
- Globe
- Glove Problem
- Glue Vector
- Gnomic Number
- Gnomon
- Gnomonic Projection
- Gnomon Magic Square
- G-Number
- Go
- Goblet Illusion
- Goldbach Conjecture
- Golden Mean
- Golden Ratio
- Golden Ratio Conjugate
- Golden Rectangle
- Golden Rule
- Golden Section