While I am having trouble sorting this into a nice fashion on our web page and World Anvil, I have created a folder for everyone to have access to Kormyrian, Baronial, and individual land sigils.
There are several file types for the majority of the symbols for different devices (embroidery machines and 3D Printers, as an example)
This link may just find itself on the main web page and World Anvil in the future if I find a nice place for them.
Retired sigils are not currently used by any players but I have left them there as a fun record of sorts.
If you are unsure if you are allowed to use a sigil in a post or not, you may ask.
(P.S. I am interested in collecting House Sigils and other In Character sigils if you want them added to the repository. Please send them to me directly at Marcella@knightrealms.com. I may put out an official call for House Sigils after our new House system is implemented!)