When you look at the view of Insert menu in opened window for MS-Word, on the far right of the Word 2016 Insert tab dwells the Symbols group. Two items are found in that group: Equation and Symbol. (If the window is too narrow, you see the Symbols button, from which you can choose Equation or Symbol.) Click the Symbol button see some popular or recently used symbols. Choose a symbol from the menu to insert the special symbol directly into your text.
To see a hoard of symbols and characters, click the Symbol button and choose the More Symbols command. The Symbol dialog box appears, as shown. Choose a decorative font, such as Wingdings, from the Font menu to see strange and unusual characters. To see the gamut of what’s possible with normal text, choose (normal text) from the Font drop-down list. Use the Subset drop-down list to see specific symbols.
When you need to inserting symbol like copyright, currency sign mathematical and more, they are not in the Keyboard, you can insert them into the document through symbol/equation tool.
How to insert the copyright symbol here?
Keep the Cursor wherever you want to insert the symbol =>
Select Insert Menu =>
Click Symbol Tool =>
Click Copyright sign.
For more understanding, look at the screenshot please: