actuarial notation
...that actuarial notation uses a halo system with superscript or subscript symbols placed before or after the main letter?
...that <b id="mwrQ"><a href="./Actuarial_notation" id="mwrg" rel="mw:WikiLink" title="Actuarial notation">actuarial notation</a></b> uses a <a class="mw-disambig" href="./Halo" id="mwrw" rel="mw:WikiLink" title="Halo">halo</a> system with <a class="mw-redirect" href="./Superscript" id="mwsA" rel="mw:WikiLink" title="Superscript">superscript</a> or <a class="mw-redirect" href="./Subscript" id="mwsQ" rel="mw:WikiLink" title="Subscript">subscript</a> symbols placed before or after the main letter?