I find out many topics on this forum concerning curved arrows,
- How to draw shape as 'curved arrows' with text (with tikz)
- Curved text (on multiple lines) within curved arrow using tikz
- Create curved TikZ single arrow
however I am not able to find among them a simple and working solution for producing folowing arrow shape:

I try using following code but it does not deliver the expected result. Could someone explain me why my approach is not showing the border in black and why the tip of the arrow is not displayed.
\documentclass[tikz, margin=10px]{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes, arrows}
\begin{document}
\begin{tikzpicture}
\draw[single arrow, draw=black, fill=gray, -stealth, line width=1pt](0,0) arc(45:-140:.5) (1.25,2);
\end{tikzpicture}
\end{document}


(1.25,2). To draw the arrow you need to change the end point. For example, just use(0,0) arc(45:-140:.5)but the result is not what you want. – Sigur Dec 07 '14 at 14:59