12345678

12345678 is an eight-digit decimal number. As a simple ascending sequence of digits from 1 to 8, it is commonly used in demonstrations and examples in computing, mathematics, and data handling to illustrate concepts such as input length, sequence generation, and sorting.

In practical usage, 12345678 appears as a placeholder value in sample data or as a default test password in tutorials. It is also used as a mnemonic-like progression in discussions of user authentication and password policies because of its predictable structure, which makes it a poor real-world credential.

Security perspective: It is widely considered a weak password because it is short, composed of a common pattern, and easily guessed. It frequently appears in password breach compilations and is commonly discouraged by security guidelines. Users are advised to choose longer passwords consisting of random characters or passphrases, ideally with multi-factor authentication.

In barcode and data encoding contexts, eight-digit sequences are used in formats such as EAN-8; however, 12345678 is not by itself a standard barcode. In practice, any code using eight digits must conform to the format's checksum rules and data structures.

Eight-digit numbers are also used as identifiers in databases or software tests, but the specific sequence 12345678 is not associated with a particular official designation.