This isn't exactly a secret, but some people may not know about it since it doesn't appear to actually be documented anywhere.
In apps that support Unicode, it's possible to input symbols that actually have no keys assigned to them. To do this, you choose "Customize Menu" from the keyboard menu. Choose the "Keyboard Menu" tab in the System Prefs window that comes up and enable "Unicode Hex Input."
Once you've done this, open an application (such as TextEdit) and choose the "Unicode Hex Input" layout from the keyboard menu. You can now enter Unicode values by holding down the option key and pushing a four-character sequence. For instance, the symbol for the command key can be written by holding down option and pushing 2318. (You can find these values with various programs, such as EasySoft Creations' freeware Font Explorer X.)
In apps that support Unicode, it's possible to input symbols that actually have no keys assigned to them. To do this, you choose "Customize Menu" from the keyboard menu. Choose the "Keyboard Menu" tab in the System Prefs window that comes up and enable "Unicode Hex Input."
Once you've done this, open an application (such as TextEdit) and choose the "Unicode Hex Input" layout from the keyboard menu. You can now enter Unicode values by holding down the option key and pushing a four-character sequence. For instance, the symbol for the command key can be written by holding down option and pushing 2318. (You can find these values with various programs, such as EasySoft Creations' freeware Font Explorer X.)
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