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From Odwiki

Tiled Block Format

The tbf format geometry file format can store all types of geometry like the bgeo/geo format file, but is structured in such a way that geometry can be loaded in a paged / tiled manner. This means that not all the geometry needs to be loaded into RAM at once - just the tile(s) we are interested in.

This particularly useful if you are writing very dense PointClouds and it makes sense to load in chunks of geometry upon demand. All areas in Houdini where you can load in geometry understand TBF files, but only a few can take advantage of the tiled RAM-conserving nature of it. The VEX pcopen()/pciterate functions definately do use of it in this RAM-friendly manner.