I accidentally deleted my default terminal icon and I also unintentionally replaced the Terminal.icns file in /Applications/Utilities/Terminal.app/Contents/Resources/Terminal.icns So can anyone provide me with the original icns file? This not a duplicate question the other question is regarding apps not icons and I have deleted the icon not app please red the question carefully
If you already updated to macOS 10.12.6 (Sierra) simply download and re-run the 10.12.6 Combo installer. One of the subsequent installer packages updates Terminal.app (with the missing Terminal.icns) which will replace your "broken" Terminal.app.
To do so would be copyright infringement; however, you could use Pacifist to extract the files from the Sierra install app.
(disclaimer: I'm the developer of Pacifist)
You can also opt for grabbing one that looks almost identical imo.
Edit: the comments mention these were extracted from Yosemite, so I guess they are actual apple icons.