
Par is just mkt maker/floor trader speak for those big round numbers like 4400, 4300. In the recording you mentioned above, he bought 95-00(par) spread for 0.95 i.e the 4295/4300 spread. He then goes on to outline the various decisions on what to do with the position now the mkt is lower & the spread trading for a small loss, one of the decision paths is to butterfly off the spread for par (00-05), this will be the 4300/4305 spread.He uses it several times when discussing possible strikes for his trades. If you look at about the last 10 minutes of the session 1 video you will hear him use it there.