Coco Peat - also known as coir pith or coir dust, is a byproduct of extracting fibres from the husk of a coconut. Coco peat is the binding material that comes from the fibre portion of the coconut husk.
Coir Fiber - a coarse fibre extracted from the fibrous outer shell of a coconut.
IBL usually refers to In-Bred Line, referring to a strain that has been back crossed repeatedly to stabilize certain expressions within the strain. I left it out of here because I felt breeder's terms were a bit much for a new grower
I did think about putting the Nute Brand abbreviations, but I had visions of some poor new grower thinking he needed all of that and nuking his plants. Plus, I don't want to seem like some kind of endorsement of one product over the other.
As far as BX, if you're referring to Backcross, would be breeder terminology and a bit more advanced than this guide was designed for.