2-peak and 3-peak backstroke

A quick google search showed a discussion of two-peak and 3-peak backstroke in Maglischo's "Swimming Fastest" book.

I use the (old-fashioned) 2-peak backstroke. I've tried the newer version, it just doesn't work for me.

What does 2-peak/3-peak mean? Deleted my previous post. Sorry - I read the BR stuff on two-peak and one-peak style.

I use the (old-fashioned) 2-peak backstroke. I've tried the newer version, it just doesn't work for me. What does 2-peak/3-peak mean?

A question to the backstrokers: do most of you swim 2-peak or 3-peak backstroke? Are the ways that Krayzelburg, Lochte, Phelps, Peirsol etc. 2-peak or 3-peak? It's not very clear to me. Thanks.:) Life-long backstroker (now breaststroker) and I've never heard of the terms. I have no idea what they mean or even what they could mean.