To Add Symbols or Special Characters to Label Styles
https://knowledge.autodesk.com/support/civil-3d/learn-explore/caas/CloudHelp/cloudhelp/2018/ENU/Civil3D-UserGuide/files/GUID-293CE79C-3390-435B-B0B8-13221482581E-htm.html
In the Text Component Editor dialog box, click the Format tab. Click in the Text Component Editor window in the location where you want to add the symbol or special character. Click Symbol. From the list, select a symbol, such as degree, diameter, or plus/minus, or a non-breaking space
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