rcirc-prompt

rcirc-prompt is a variable defined in `rcirc.el'.
Its value is

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Documentation:
Prompt string to use in IRC buffers.

The following replacements are made:
%n is your nick.
%s is the server.
%t is the buffer target, a channel or a user.

Setting this alone will not affect the prompt;
use either M-x customize or also call `rcirc-update-prompt'.

You can customize this variable.