The "abc123.mp4" file name is often a placeholder used in technical documentation, but it is also a well-known reference in the Undertale community to a hidden file named . The Story of abc_123_a
: Due to its simplicity, "abc123" is cited as one of the most commonly used (and insecure) passwords globally. P-Video - Pruna documentation abc123.mp4
: Numerous YouTube channels like Jolly ABC TV and brands like Scholastic Early Learners use "ABC 123" branding for videos and workbooks designed to teach toddlers basic literacy and numeracy. The "abc123
Outside of gaming, "abc123" is a standard placeholder string used in various fields: Outside of gaming, "abc123" is a standard placeholder
In the original game files for Undertale , developer Toby Fox included a sound file titled to catch "data miners"—players who dig through code to find secrets before they are meant to be seen.
: The file became so iconic that it was later used in an Alternate Reality Game (ARG) by YouTuber Sr Pelo for his Underpants parody series. Technical and Educational Context
: It is frequently used in technical documentation, such as the Pruna P-Video guides , to demonstrate how to iterate on video generation prompts using draft modes.