How to Input a Registered Trade Mark Sign Into a Title

Hello everyone,

I am trying to get a registered trade mark sign (®) into the title of my item to be cited. I am using Zotero 5.0.92 along with better bib tex (BBT), BibTeX and LaTeX.

I tried to use

1. \u00AE
2. {\\textregistered}
as well as
3. {\textregistered}

e.g. like: 'Gx \u00AE Nadelspritzen'

suggested here:

Neither Unicode nor the LaTeX Code worked for me.

Can someone help me out?

Thank you,
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