56ab

Based on the information provided, it seems like "56ab" is a combination of letters and numbers. However, without any context or specific meaning assigned to these characters, it is difficult to determine a specific answer or explanation.

If you are referring to a mathematical expression or equation, it is important to note that letters (usually represented as variables) are commonly used to represent unknown values, while numbers have their usual numeric meaning. In this case, "a" and "b" could represent unknown variables, and further information might be required to solve or evaluate the expression.

If you have a specific question related to "56ab" or need further assistance, please provide more details or context so that I can try to help you better.