Well I have no sure idea about these terms but I think there are two levels of highest points which is higher high and lower high and same thing with the lowest levels which is lower low and higher low .
I think that forex trading give us advantages to making profits regularly .Forex trading can do in anywhere and anytime as i have internet connection. My dream is be a successful trader an living from it
and i think finally it brings me a lot of money in my real life.
in the definitions above every trader should be able to distinguish between these terms by using a candle stick will be more clearly understand because it is part of the name used to trade
if market is on upward trend it is called higher and if it breaks its top and go more high it is called higher high and same for low and lower low.Best of luck.
i don't now
good luck