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I would want to know in which package the symbol \hbar is defined. In fact I ask this because I need to create a letter like \hbar but with 'k' instead of 'h'.
\hbar is defined in the LaTeX kernel:
should do what you want (although it might need some customization if other fonts are used).
texdef -t latex hbar
less $(kpsewhich latex.ltx)
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