Can't find a command for actuarial angle

Question

I'm trying to properly render the following formula:

This is what I've got so far:

aufgel"ost nach $B^A$ ergibt sich

\begin{equation}
    \boxed{B^A = \mathit{VS} \cdot \frac{_{\textbar n}A_x + \mathrm{"a}_{x:n} \cdot \gamma}{(1 - \beta) \cdot \mathrm{"a}_{x:t} - t \cdot \alpha^Z}}
\end{equation}

bzw. f"ur $t = n$

Rendered result:

However, I can't find the symbol for the actuarial angle for the letters n and t in the numerator and denominator in the AMS symbols list.

Answer 1

While this may be closed as a dup of Typesetting annuity and life-insurance symbols in ConTeXt, a note to future readers - instead of using a self-made construct suggested in its accepted answer, consider using the actuarialangle for the symbol in LaTeX. The package is part of TeXLive, so you don't need to install anything else. Here's what the above formula looks like in the end:

\usepackage[thickspace,nobracket]{actuarialangle}

...

\begin{equation}
    \boxed{B^A = \mathit{VS} \cdot \frac{_{\textbar n}A_x + \mathrm{"a}_{x:\actuarialangle{n}} \cdot \gamma}{(1 - \beta) \cdot \mathrm{"a}_{x:\actuarialangle{t}} - t \cdot \alpha^Z}}
\end{equation}

Rendered output:

Source.