The code first appeared as 451 in System Shock (1994) and then as 45100 in System Shock 2 (1999). Both games were developed by Looking Glass Studios. During the development of System Shock, the number was added to the game as a reference to Ray Bradbury's dystopian novel Fahrenheit 451.In this novel, the number represents "the temperature at which book-paper catches fire and burns.

Source: https://deusex.fandom.com/wiki/0451

Product features
- 100% ring-spun US cotton — substantial, long-lasting feel
- Garment-dyed finish for soft color and lived-in texture
- Heavyweight 6.1 oz fabric with relaxed fit and pre-shrunk stability
- Tubular, side-seam-free construction and double-needle stitched seams for durability
- Size range S–4XL with sewn-in label; available in 58 colors

Care instructions
- Machine wash: cold (max 30C or 90F)
- Do not bleach
- Tumble dry: low heat
- Iron, steam or dry: low heat
- Do not dryclean