[![enter image description here](https://i.stack.imgur.com/aUMd3.jpg)](https://i.stack.imgur.com/aUMd3.jpg)

Building on a previous question of mine [about `tikzpicture`](https://tex.stackexchange.com/questions/665556/how-to-make-achieve-better-positioning-of-elements-in-a-tikzpicture), how do I get the encircled arrows in the image as arrows between nodes, and what is the name of the symbol? I assume I still use `draw` but I have not been able to figure it out.
Also a list of arrow-options for `draw` would be appreciated.

Currently I have the following:

```
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric, arrows}
\usetikzlibrary{positioning, arrows.meta}
\begin{document}
\begin{tikzpicture}
\node at (0,0) (qob) {Quarter of Birth};
\node[right=1cm of qob] (sch) {Schooling};
\node[right=1cm of sch] (wage) {Wage};
\node[below=1cm of sch] (abi) {Ability $\in \:u$};

\draw[$\nsenwarrows$] (abi) to (sch);
\draw[->, red] (abi) to (sch);
\draw[->] (abi) to (wage);
\draw[->] (qob) to (sch); %here I want to have "relevance" above the arrow
\draw[->] (sch) to (wage); %here i want a "?" above the arrow
\draw[\n$\nsenwarrows$] %here I want to replace the arrow with \nsenwarrows and write "exogeneity" below

\end{tikzpicture} 
\end{document}

```