Alphanumericals

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Alphanumericals" – news · newspapers · books · scholar · JSTOR (May 2012) (Learn how and when to remove this message) This article may be confusing or unclear to readers. Please help clarify the article. There might be a discussion about this on the talk page. (October 2023) (Learn how and when to remove this message) (Learn how and when to remove this message)

Look up alphanumeric or alphanumerical in Wiktionary, the free dictionary.

Alphanumeric characters or alphanumerics refers to characters belonging to the English alphabet and Arabic numerals. It includes both lower and uppercase characters. The complete list of alphanumeric characters in lexicographically ascending order is: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz.

Different alphanumeric characters have similar appearances, such as I (upper case i), l (lowercase L), and 1 (one), and O (uppercase o), Q (uppercase q) and 0 (zero).^[1] Other similarities can include 5 and S, Z and 2.