%>% means whatever you want it to mean, in Base R anyway: > %>% Error: unexpected SPECIAL in "%>%". (which means that symbol is not defined.).
The infix operator %>% is not part of base R, but is in fact defined by the package magrittr (CRAN) and is heavily used by dplyr (CRAN). It works like a pipe...
Clustering techniques have a wide use and importance nowadays. This importance tends to increase as the amount of data grows and the processing power of the computers increases. Clustering applications are used extensively in various fields such as artificial intelligence, pattern recognition, economics...
Then the dot has special meaning. For all objects with class myclass calling. Myfunction(a). Will actualy call function myfunction.myclass: > myfunction(a)  2. This is used widely in R...