Symbol of the tennis ball
You can define a picture.
\documentclass{standalone}
\newcommand\tennisBall{%
\setlength{\unitlength}{1cm}%
\begin{picture}(1,1)(-.5,-.5)
\put(0,0){\circle{1}}
\qbezier(0,-.49)(0,0)(.4825,-.0850)
\qbezier(0,.49)(0,0)(-.4825,.0850)
\end{picture}%
}
\begin{document}
\tennisBall
\end{document}
Well, package fontawesome
seems to be not longer maintained and therefore you can not add with LaTeX and this package an symbol for an ball into your document.
But you can use package fontawesome5
.
The font shows the following ball symbols on the web page:
As you can see the symbol for an tennis ball is grey that means you have to pay for the fontawesome5 pro font to be able to use it. Only the black shown symbol are available in the free font version.
So you can try for example:
\documentclass{article}
\usepackage{fontawesome5} % <============================================
\begin{document}
\faTwitter
\faLinkedin
\faGithub
\faBasketballBall\ or \faIcon{basketball-ball} % <======================
\faBaseballBall\ or \faIcon{baseball-ball} % <==========================
\end{document}
with the resulting pdf: