The default 'increment marker' (the character that separates the base variable name from the incremented value) is "@".
Examples: The variable [Child] becomes [Child@1], [Child@2], etc.
You can choose a different marker, or choose not to have a marker at all. Make your choices at the 'Repeats' tab of the 'All Settings and Options' screen.
If you want to exclude the separator altogether, check the Exclude Separator box at the left.
Sample result: [Child1], [Child2], etc.
If you want to change the separator itself, select the desired Separator Character from the dropdown list at the left.
Sample result: [Child_1], [Child_2], etc.
If you don't like the default placement of the at the end of the variable, 'tell' Pathagoras where to put the incrementing number by pre-placing the '@' sign in the 'repeat' text block itself. So, if a variable were written [Shareholder@ Address], it would increment [Shareholder@1 Address], [Shareholder@2 Address], etc.
Some variables within a Repeat block (such as [Date]) don't need to be incremented as the text block is being repeated. It will be the same value in all cases. You can tell Pathagoras not to increment a variable by inserting a 'Don't Increment' character as the last character of the variable name. The default 'Don't Increment' character is the underscore. The variable might look like this: [Date_]. (When the document is processed, the underscore will be removed, unless you uncheck the box that tell Pathagoras to do so.)