Northern Ireland Flag SVG
If you use Flag icon css "https://github.com/lipis/flag-icon-css"
Download the files
gb-nir-1x1.svg
Save the file on flags/1x1
gb-nir-4x3.svg
Save the file on flags/4x3
Then add these lines to the flag.css
.flag-icon-gb-nir {
background-image: url(../flags/4x3/gb-nir-1x1.svg);
}
.flag-icon-gb-nir.flag-icon-squared {
background-image: url(../flags/1x1/gb-nir-4x3.svg);
}
Feel free to use those files for any other purpose.