: For example, some digital reprints or specific hardware components (like GPUs or projectors) use complex codes as identifiers.

The term specifically refers to a standard digital multimedia container format used to store video, audio, and subtitles. In some niche contexts, similar alphanumeric strings are used as:

: The prefix MP4 was famously used by the McLaren racing team for their cars from 1981 to 2016, followed by a specific number (e.g., MP4/4).