I saw that, but it’s still not what I’m looking for 
Everywhere in the templates, <<currentColumn>> is called, including in the default header template $:/plugins/kookma/shiraz/tables/templates/header/default:
<th>
<%if [<tempTableSort>getindex[sortIndex]match<currentColumn>] %><!--if table is sorted based on current column -->
<%if [<tempTableSort>getindex[hasnegate]match[false]] %><!--set negate for sort-->
<$button setTitle=<<tempTableSort>> setIndex="hasnegate" setTo="true" class="tbl-sort-svg tc-btn-invisible tc-tiddlylink" >
<$action-setfield $tiddler=<<tempTableSort>> $index="sortFlag" $value="reverse,caseinsensitive"/>
<$text text=<<currentColumn>>/> {{$:/core/images/down-arrow}}
</$button>
<%elseif [<tempTableSort>getindex[hasnegate]match[true]] %><!--remove negate for sort-->
<$button setTitle=<<tempTableSort>> setIndex="hasnegate" setTo="false" class="tbl-sort-svg tc-btn-invisible tc-tiddlylink" >
<$action-setfield $tiddler=<<tempTableSort>> $index="sortFlag" $value=""/>
<$text text=<<currentColumn>>/> {{$:/core/images/up-arrow}}
</$button>
<%endif%><!-- end of nested if: set negate -->
<%else%><!--if table is not sorted based on current column -->
<$button setTitle=<<tempTableSort>> setIndex="sortIndex" setTo=<<currentColumn>> class="tc-btn-invisible tc-tiddlylink" >
<$action-setfield $tiddler=<<tempTableSort>> $index="hasnegate" $value="false"/>
<$action-setfield $tiddler=<<tempTableSort>> $index="sortFlag" $value=""/>
<$text text=<<currentColumn>>/>
</$button>
<%endif%>
</th>
Where is <<currentColumn>> defined?
I noticed that for dynamic tables, you reference an parameter called “filed” often in examples like in demo/dynamic-tables/searchable where you create a temp tiddler to store the contents of a search input: