What does the '#' at the end of Int signify, such as in Int16?

The presence of the '#' symbol at the end of Int, such as in Int16, indicates the size of the integer type. More specifically, Int16 refers to a 16-bit signed integer. The number itself (16 in this case) signifies the number of bits used to represent the integer, which directly correlates to the range of values it can store. Hence, knowing that an Int16 can represent numbers from -32,768 to 32,767 provides an understanding that the size of the integer is indeed related to how large of a number it can hold. This is a key concept in programming and data type definition, as different types of integers (like Int8 or Int32) can hold different ranges of values based on their bit size.