If you are using a computer with a numeric keypad these are called Alt Key Codes. You simply hold down the Alt key and type in specific numbers on the keypad. Ex: Alt + 0153 = ™ / Alt + 0162 = ¢ / Alt + 0169 = © / Alt + 0174 = ® etc.
I'm so old I still look for the ¢ sign on my desktop
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