Editing List of Microsoft codenames (section)

===Windows platform engineering milestones===
The following are code names used for internal development cycle [[Iterative and incremental development|iterations]] of the Windows core, although they are not necessarily the code names of any of the resulting releases. With some exceptions, the semester designations usually matches the Windows version number.

{| class="sortable wikitable"
|-
! Codename
! Semester
! Release
! Notes
! Ref
|-
| Titanium
| 19H1
| [[Windows 10]] May 2019 Update
| Named after the [[Titanium|chemical element]] in the periodic table.
|<ref name=":0">{{Cite web|last=Foley|first=Mary Jo|title=What comes after Windows 10 19H1? Vanadium|url=https://www.zdnet.com/article/what-comes-after-windows-10-19h1-vanadium/|access-date=2020-06-25|website=ZDNet|language=en|archive-date=2022-02-23|archive-url=https://web.archive.org/web/20220223081546/https://www.zdnet.com/article/what-comes-after-windows-10-19h1-vanadium/|url-status=live}}</ref><ref>{{cite web |last1=Hassan |first1=Mehedi |title=Windows 10's Next Major Updates Will Be Codenamed Vanadium, Vibranium |url=https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |website=Thurrott |date=October 31, 2018 |publisher=BWW Media Group |access-date=13 June 2021 |quote=Windows 10’s next major update is codenamed 19H1. |archive-date=13 June 2021 |archive-url=https://web.archive.org/web/20210613205930/https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |url-status=live }}</ref>
|-
| Vanadium
| 19H2
| [[Windows 10]] November 2019 Update
| Named after the [[Vanadium|chemical element]] in the periodic table.
|<ref name=":0"/><ref name="Future US, Inc">{{cite web |last1=Brown |first1=Matt |title=Next Windows 10 updates reportedly codenamed 'Vanadium' and 'Vibranium' |url=https://www.windowscentral.com/next-windows-10-updates-reportedly-codenamed-vanadium-and-vibranium |website=Windows Central |date=October 31, 2018  |access-date=13 June 2021 |archive-date=13 June 2021 |archive-url=https://web.archive.org/web/20210613205931/https://www.windowscentral.com/next-windows-10-updates-reportedly-codenamed-vanadium-and-vibranium |url-status=live }}</ref><ref>{{cite web |last1=Hassan |first1=Mehedi |title=Windows 10's Next Major Updates Will Be Codenamed Vanadium, Vibranium |url=https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |website=Thurrott |date=October 31, 2018 |publisher=BWW Media Group |access-date=13 June 2021 |quote=This means the next Windows 10 update, previously codenamed 19H2, will be called Vanadium (comes after Titanium/19H1). |archive-date=13 June 2021 |archive-url=https://web.archive.org/web/20210613205930/https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |url-status=live }}</ref>
|-
| Vibranium
| 20H1
| [[Windows 10]] May 2020 Update<br>[[Windows 10]] October 2020 Update<br>[[Windows 10]] May 2021 Update<br>[[Windows 10]] November 2021 Update<br>[[Windows 10]] 2022 Update
| Named after the fictional metal [[Vibranium]] in [[Marvel Comics]] as continuing the previous line of [[chemical element]]s with [[Chromium]] could have caused confusion with the [[Chromium (web browser)|web browser project]].
|<ref name=":0" /><ref name="Future US, Inc"/><ref>{{cite web |last1=Hassan |first1=Mehedi |title=Windows 10's Next Major Updates Will Be Codenamed Vanadium, Vibranium |url=https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |website=Thurrott |date=October 31, 2018 |publisher=BWW Media Group |access-date=13 June 2021 |archive-date=13 June 2021 |archive-url=https://web.archive.org/web/20210613205930/https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |url-status=live }}</ref>
|-
| Manganese
| 20H2
| {{N/A}}{{efn|name=insider}}
| Named after the [[Manganese|chemical element]] in the periodic table.
|<ref>{{Cite web|last=Tiwari|first=Aditya|date=2020-04-11|title=The Next Windows 10 Version Is Called "Manganese"|url=https://fossbytes.com/the-next-windows-10-version-is-called-manganese/|access-date=2020-06-25|website=Fossbytes|language=en-US|archive-date=2021-06-12|archive-url=https://web.archive.org/web/20210612203849/https://fossbytes.com/the-next-windows-10-version-is-called-manganese/|url-status=live}}</ref>
|-
| Iron
| 21H1
| [[Windows Server 2022]]{{efn|name=iron}}
| Named after the [[Iron|chemical element]] in the periodic table.
|<ref>{{Cite web|last=Shaikh|first=Rafia|date=2020-05-22|title=Windows 10 2021 Is Codenamed Iron (Fe) - Deleted Text Reveals|url=https://wccftech.com/windows-10-2021-is-codenamed-iron-fe-deleted-text-reveals/|access-date=2020-06-25|website=Wccftech|language=en-US|archive-date=2021-04-21|archive-url=https://web.archive.org/web/20210421140231/https://wccftech.com/windows-10-2021-is-codenamed-iron-fe-deleted-text-reveals/|url-status=live}}</ref>
|-
| Cobalt
| 21H2
| [[Windows 11]]
| Named after the [[Cobalt|chemical element]] in the periodic table.
|
|-
| Nickel
| 22H2
| [[Windows 11]] 2022 Update
|Named after the [[Nickel|chemical element]] in the periodic table. Originally planned to be the 22H1 semester, although that semester was ultimately skipped and Nickel shifted to 22H2, expanded to span the entire year.
|<ref>{{Cite web|last=Nayan|date=2021-06-21|title=Development of Windows 11 Summer'21 (co_release) & Fall'21 (co_refresh) releases explained in a collated timeline|url=https://thewincentral.com/windows-11-summer21-co_release-fall21-co_refresh-developments-explained-in-a-collated-timeline/|access-date=2021-08-17|website=WinCentral|language=en-US|archive-date=2021-08-17|archive-url=https://web.archive.org/web/20210817022518/https://thewincentral.com/windows-11-summer21-co_release-fall21-co_refresh-developments-explained-in-a-collated-timeline/|url-status=live}}</ref>
|-
| Copper
| 23H1
| {{N/A}}{{efn|name=insider}} <!-- builds from the RS_PRERELEASE branch are not matched to a specific Windows 11 release. -->
|Named after the [[Copper|chemical element]] in the periodic table.
|<ref>{{cite web|last1=Parmar|first1=Mayank|title=Windows 11 Build 22449 is now available with new loading animation|url=https://www.windowslatest.com/2021/09/03/windows-11-build-22449-is-now-available-with-new-loading-animation|website=Windows Latest|date=2 September 2021 |access-date=January 25, 2022|archive-date=January 25, 2022|archive-url=https://web.archive.org/web/20220125131232/https://www.windowslatest.com/2021/09/03/windows-11-build-22449-is-now-available-with-new-loading-animation/|url-status=live}}</ref>
|-
| Zinc{{citation needed|date=August 2023}} <!-- would make sense (follows previous names), but authoritative reference needed -->
| 23H2
| Windows Server, version 23H2
|Named after the [[Zinc|chemical element]] in the periodic table. 
|-
| Gallium {{citation needed|date=August 2023}} <!-- would make sense (follows previous names), but authoritative reference needed -->
| 24H1
| {{N/A}}{{efn|name=insider}} <!-- builds from the RS_PRERELEASE branch are not matched to a specific Windows 11 release. -->
|Named after the [[Gallium|chemical element]] in the periodic table.
|-
| Germanium {{citation needed|date=February 2024}} <!-- would make sense (follows previous names), but authoritative reference needed -->
| 24H2
| [[Windows 11]] 2024 Update<br/>[[Windows Server 2025]]
|Named after the [[Germanium|chemical element]] in the periodic table.
|-
| Dilithium {{citation needed|date=August 2024}} <!-- would make sense (follows previous names), but authoritative reference needed -->
| 25H1
| {{N/A}}{{efn|name=insider}}
|Named after the [[Dilithium (Star Trek)|fictional material]] from ''[[Star Trek]]''.
|-
| Selenium {{citation needed|date=April 2025}} <!-- would make sense (follows previous names), but authoritative reference needed -->
| 25H2
| {{N/A}}{{efn|name=insider}}
|Named after the [[Selenium|chemical element]] in the periodic table.
|}
{{notelist|refs=
{{efn|name=insider|Builds of these semesters were only released via the Windows Insider program.}}
{{efn|name=iron|Windows Server 2022 reports as version 21H2, although it is in fact based on the earlier Iron codebase.}}
}}