Build list legend
|Version of Microsoft Windows
|Windows 11 (NT 10.0)
Dilithium is the 25H1 engineering milestone of Windows as a service taking place since January 2024.
It is codenamed after the fictional material from Star Trek due to negative associations of arsenic (the element after germanium in the periodic table), as it is infamous for its use in poisons due to its toxic properties. This is the second time a fictional element from popular culture was used as the codename for a semester instead of continuing the previous line of chemical elements – the 20H1 semester had previously been codenamed after the Vibranium metal from the Marvel Universe instead of Chromium to prevent confusion with the web browser project.