What does [MT] mean in the Geant4 banner?

 Geant4 version Name: geant4-11-02 [MT]   (8-December-2023)
                       Copyright : Geant4 Collaboration
                      References : NIM A 506 (2003), 250-303
                                 : IEEE-TNS 53 (2006), 270-278
                                 : NIM A 835 (2016), 186-225
                             WWW : http://geant4.org/

I know I am in sequential mode.

That the Geant4 libraries linked against were built with multithreading support. It’s still possible to build/run a fully sequential application with libraries built in MT mode. Running like this may have a slight performance penalty compared to “pure” sequential, but that should be small (and only measurable by profiling the concrete application).

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