Definition:Geometric Progression/Term

Let $\left \langle{x_n}\right \rangle$ be a geometric progression in $\R$ defined as:
$x_n = a r^n$ for $n = 0, 1, 2, 3, \ldots$
$x_n$ for $n = 0, 1, 2, 3, \ldots$
are the terms of $\left \langle{x_n}\right \rangle$.