. Released in in partnership with Samsonite, it was a specialized set designed to add mechanical motion to LEGO builds . Because it was one of the first sets to use a three-digit numbering system, some collectors jokingly or mistakenly refer to it as the "first" LEGO set . 2. Software and Data Science
: In neuroimaging and EEG analysis, .set is a common file format (EEGLAB). Users often work with files like sub-001.set to store raw or processed brain activity data . 3. Trading Card Games (TCG) SET 001
: It can also denote specific accessory lines, such as the Special Set #001 Playmat and Sleeves used in Pokémon TCG Pocket . 4. Technical and Regulatory Forms SET 001