All Ways to Insert Special Symbols in Emacs
Thanks to Uriel Frisch for $15 for purchasing my emacs tutorial. (See: donation.)
Uriel asked about how to enter accented letters with emacs. Here's some relevant articles.
On mac, you can enter accented letter with the Option key. See: Mac OS X Keyboard Viewer and Unicode. You can also change a config file so the keys type any unicode you want. See: Creating Keyboard Layout in Mac OS X. The above solutions are system-wide for the Mac.
For within emacs, here are also several solutions. Emacs support entering common accented letter and symbols by default. See: Emacs and Unicode Tips. Again, you can also create your custome keys to enter any unicode symbol. If you want custome symbols or keys, see: