Windows 10 Vanadium: Traditionally, Microsoft uses codenames for the versions of Windows it develops. So every version of Windows 10 that has been released to date has its own password name.
The original release, for example, was released as "Threshold." The next five releases used code as "Redstone."
Since then, Redstone has changed.
For the story below, there are all Windows 10 code names:
Threshold 1: Windows 10 / 1507
Threshold 2: Windows 10 November Update / 1511
Redstone 1: Windows 10 Anniversary Update / 1607
Redstone 2: Windows 10 Creators Update / 1703
Redstone 3: Windows 10 Fall Creators Update / 1709
Redstone 4: Windows 10 April 2018 Update / 1803
Redstone 5: Windows 10 October 2018 Update / 1809
19H1: Windows 10 April 2019 Update / 1903 or Windows 10 Vanadium
As you may already know, the upcoming release of Windows 10 to be released in the first half of next year is codenamed 19H1. This release will be released publicly, probably in April 2019.
Information leaked today indicates that the version released after 19H1 will be codenamed "Vanadium". Vanadium is one chemical element which has the 23 atomic number.
So, as it seems, Microsoft will use real and fictitious names of chemical elements as a Windows password. This is probably due to the fact that Windows engineering has been transferred to the Azure team, which uses the same naming system.
So instead of the 19H2 we know as the Windows 10 code name in the 1909 version, Vanadium will be used. Don't be surprised if you see Windows 10 tomorrow with the code name 'Chromium.'
Below is a list of all Windows password names from 3.1.
Windows 3.1: Janus
Windows for Workgroups 3.x family: Sparta, Winball, Snowball
Windows NT 3.1: NT OS / 2
Windows NT 3.5: Daytona
Windows 95: Chicago
Windows 95 OSR2: Detroit
Windows NT 4.0: Shell Update Release
Windows 98: Memphis
Windows 2000: No codename
Windows Me: Millennium
Windows XP: Whistler
Windows XP Service Pack 2: Springboard
Windows Vista: Longhorn
Windows 7: Blackcomb, Vienna
Windows 8: Metro / Jupiter
Windows 8.1: Blue