I believe the "V" you refer to is an upside down Greek "Lamda" modelled after the Spartan Shield:

https://obscurehollywood.net/art/The-300-Spartans-1962.jpg

From Assassin's Creed:

https://i.ytimg.com/vi/9EkhbJBQUr4/maxresdefault.jpg

Thanks for the link to the James Twining article. 🐸

This Linky thingy workie moar bettah:

https://www.jamestwining.com/learn-more/the-black-sun/the-black-sun/

However, I believe the "V" you refer to is an upside down Greek "Lamda" modelled after the Spartan Shield:

https://obscurehollywood.net/art/The-300-Spartans-1962.jpg

From Assassin's Creed:

https://i.ytimg.com/vi/9EkhbJBQUr4/maxresdefault.jpg

Thanks for the link to the James Twining article. 🐸