The term "b_n" often refers to a sequence or a specific term in a mathematical series. In mathematics, sequences are ordered lists of numbers that follow a particular pattern or rule. The notation "b_n" typically indicates the nth term of a sequence, where "n" is a positive integer representing the position of the term in the sequence. In various contexts, "b_n" can represent different sequences, such as Fibonacci numbers or geometric progressions. Each sequence has its own defining formula or rule that determines how to calculate its terms. Understanding "b_n" is essential for studying patterns in mathematics and can be applied in fields like statistics and computer science.