He's gorgeous!!
Cloud... BCI stands for Boa Constrictor Imperator, which is the scientific name for the Columbian Boa and others from that part of the world. They are also sometimes referred to as RTB or Red Tail Boas.
There are also BCC, which is Boa Constrictor Constrictor...which look very similar to BCI, but generally grow larger and typically have a much brighter red tail...also sometimes referred to as True Red Tails. Suriname would be an example of BCC.