The term 'and so on, when tripled' can be represented by two crossword solutions: YADDA (5 letters) and YADA (4 letters). YADDA is a slang term that is used to indicate that something is continuing or repeating. It is often used in place of saying 'etcetera' or 'and so forth'. YADA is another slang term that is used to indicate that someone is talking about something without providing any details. It is often used in place of saying 'blah blah blah'. Both terms are used to indicate that something is continuing or repeating without providing any further information.