The notation "B(1, 2)" refers to a specific type of mathematical function known as the Beta function. In this case, the parameters 1 and 2 indicate the values used in the function's calculation. The Beta function is often used in calculus and statistics, particularly in relation to probability distributions. The value of "B(1, 2)" can be computed using the formula for the Beta function, which involves the Gamma function. Specifically, "B(1, 2)" equals 1 divided by 2, resulting in a value of 0.5. This function is useful in various applications, including combinatorics and statistical analysis.