The term 'conjunction in rebus puzzles' refers to the use of a three-letter word, such as 'OAR', to represent a longer phrase or sentence. This type of puzzle is often used in crosswords and other word games. The solution for the term 'conjunction in rebus puzzles' is 'OAR', which stands for 'Or And/Or But'. This phrase is used to join two or more ideas together, making it a useful tool for creating complex sentences.