The phrase "yen pairs" refers to currency pairs that involve the Japanese yen. In forex trading, a currency pair consists of two currencies, and if one of them is the Japanese yen, it is called a yen pair. Full definition
S. dollar currency pair, but it is only receiving a 75 percent rate of return, it might be more profitable for you to trade the U.S. dollar / Japanese yen pair at 82 percent. (binaryoptionsu.com)
But just like the other yen pairs, I'm only interested in selling opportunities. (dailypriceaction.com)
Overall, nothing really new or unexpected, which is probably why the event was a dud (as usual) and yen pairs turned to bond yields for directional cues. (babypips.com)