Joint-Life First-Survivor Insurance Symbol

The code:

\documentclass[12pt]{article}
\usepackage[margin=2cm]{geometry}
\usepackage{amssymb}
\usepackage{mathtools}
\usepackage [english]{babel}
\usepackage [autostyle, english = american]{csquotes}

\def\annu#1{{% 
  \vbox{\hrule height .2pt 
    \kern 1pt 
    \hbox{$\scriptstyle {#1}\kern 1pt$}% 
  }\kern-.05pt 
  \vrule width .2pt 
}}

\begin{document}
\begin{align*}
A^{\mathclap{\phantom{\,\scriptstyle 40:50\,}1}}_{\overbrace{\scriptstyle 40:50}:\annu{10}}
\end{align*}
\end{document}

For the annuity I used the definition in the answer to Annuity notation in LaTeX.

This?

\documentclass[12pt]{article}
\usepackage[margin=2cm]{geometry}
\usepackage{amsmath, amssymb}
\usepackage [english]{babel}
\usepackage [autostyle, english = american]{csquotes}
\begin{document}
\[
A{\scriptstyle\overbrace{\scriptstyle 40{:}50}^1:\overline{10}|}
\]
\end{document}

Or replaceing both \scriptsyle by \scriptscriptstyle :

I had the same problem with the actuarial symbol and the subscript/superscript, sooo I made a package to make my life easier and help other.

Plus, I’ve add some shortcut to save time.

The project page and the CTAN.

All you need is the actuarialsymbol package.

At the beginning of the code you have to write

\usepackage{actuarialsymbol}

For the sub/superscript

\actsymb['subscripLeft']['superscriptL']{<middle>}{'subscriptR'}{'superscriptR'}

Example of output:

Example of shortcut for actuarial symbol :