The term APPROX. can be represented by several abbreviations in a crossword puzzle. CIR stands for 'CIRCA' and is three letters long. CEST stands for 'Central European Summer Time' and is four letters long. ABT stands for 'ABOUT' and is three letters long. EST stands for 'Eastern Standard Time' and is three letters long. CIRC stands for 'CIRCUMSTANCE' and is four letters long. ESTD stands for 'ESTABLISHED' and is four letters long. All of these abbreviations are used to indicate that something is approximate or uncertain.