The element variable {ce_last} is parsed inside every element to indicate if it is the last element for this entry_id (across all element types). It has a boolean value of true (1) or false (empty) used for conditionals.
Simplified case example:
{exp:channel:entries channel="your_channel" limit="10"} {custom_field} {heading} {value} {/heading} {wysiwyg} {value} {!-- This text will be printed only after wysiwyg which is also the last element in entry --} {if ce_last}<p>This wysiwyg is printed as the last element.</p>{/if} {/wysiwyg} {text_field} {value} {/text_field} {/custom_field} {/exp:channel:entries}