A convergent argument presents two or more independent reasons for the one conclusion. For example:

You sbouldn’t go to the party; firstly, the kinds of people who go to the party are loud and rude and secondly, you have no way to return home afterwards.

The conclusion is 1. that you shouldn’t go to the party. The reasons are:

2. the kinds of people who go to the party are loud and rude

3. you have no way to return home afterwards.

If we number them as conclusions and reasons, it looks like this:

[2] [3]
↘ ↙
(1)