french threads have a different width between the threads than british/standard. so, your bb and steerer tube (and maybe even pedals) have french threads. if the fixed cup of the bb on the drive side tightens when turning to the left (like most other bb fixed cups and left side pedal axles), we call that swiss threading. on the other hand, if the french threaded fixed cup is 'righty tighty,' we just call that french, 'cause that's just weird.