The rise of the US dollar versus the yen is referred to as “strong / weak yen,” whereas the fall is referred to as “weak US dollar / strong yen.”
The "exchange rate" is the rate at which two currencies are exchanged. If one currency's value rises, the value of the other currency falls.
In other words, a falling US dollar/yen is a "strong yen" for the Japanese yen and a "weak US dollar" for the US dollar, while a rising US dollar/yen is a "weak yen" for the Japanese yen and a "strong US dollar " for the US dollar.
Currency strength can be reflected in a variety of ways. As seen above, if the US dollar / yen rises, it is referred to as "strong US dollar / weak yen," and if it falls, it is referred to as "weak US dollar / strong yen."
