What term is used for a dummy value that signifies the end of a data list?

The term "Sentinel Value" is used to refer to a dummy value that signifies the end of a data list. In programming and various algorithms, a sentinel value is often placed at the end of a collection or data structure to indicate that there are no more valid entries or to signal the termination of a process. For example, in an array, you might use a specific value that would not normally be part of the data to indicate the end of a list, such as using -1 to terminate a list of positive integers.

Sentinel values are particularly useful in iterative processes where you traverse a data structure, allowing the code to check for this specific value to know when to stop processing. It enhances clarity and efficiency in managing data flow and prevents errors that could arise from trying to access data beyond the intended bounds.

In contrast, the other terms do not inherently imply a termination point for a data list. An end value typically describes a final value but does not specify that it is a designated marker. A null value is often used to indicate the absence of a value but is not specifically for denoting the end of a list. A placeholder serves a different purpose, generally indicating a temporary stand-in for a value that will be provided later, rather than