erc-lurker-trim-nicks

erc-lurker-trim-nicks is a variable defined in `erc.el'.
Its value is

t

Documentation:
If t, trim trailing `erc-lurker-ignore-chars' from nicks.

This causes e.g. nick and nick` to be considered as the same
individual for activity tracking and lurkiness detection
purposes.

You can customize this variable.