;IRL: In Real Life = A TLA used when 'virtual' was a thing. Now the virtual has permeated 'meat space' and so the two are not so distinct.
;ISBN: International Standard Book Number = 10-digit or 13-digit codes used by the publishing industry to uniquely identify individual book titles and editions. Some 10-digit ISBNs may end with an "X" instead of a digit.
;ISO 27000127001: [[wp:ISO/IEC 27001]] is an international standard to manage information security. The standard was originally published jointly by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC) in 2005, revised in 2013, and again most recently in 2022. There are also numerous recognized national variants of the standard. It details requirements for establishing, implementing, maintaining and continually improving an information security management system (ISMS) – the aim of which is to help organizations make the information assets they hold more secure. Organizations that meet the standard's requirements can choose to be certified by an accredited certification body following successful completion of an audit. The effectiveness of the ISO/IEC 27001 certification process and the overall standard has been addressed in a large-scale study conducted in 2020.
;JS: JavaScript = A computer language.
;JSON: JavaScript Object Notation = A data representation format in JavaScript