I suspect that's a shorthand for Bromoil Transfer -- essentially, the same process as Bromoil, except that once the color is applied to the print, it's brayed down on a receptor sheet that is the final display print. As I understand it (having never done any kind of Bromoil) the transfer print can be reinked and used a number of times.

For any alternative process, the first place I'd look is the Unblinking Eye web site.