Here you can find an Overleaf template in which it is included a figure called "IseCure.pdf". In that figure there is a symbol like a letter "i" inscribed in a circle. And that symbol can't be selected when the figure is opened in Adobe Acrobat.
My question is: is it possible to build such a symbol, in a more or less simple way, with TikZ? Or, more in general, is it possible to "bring" to TikZ any figure (for example, something in jpeg format)?
Thank you so much.

