I'm reading about stationary states in QM and the following line, when discussing the time-independent, one-dimensional, non-relativist Schrodinger eqn, normalization or the lack thereof, and the Hamiltonian, this is mentioned: "In the spectrum of a Hamiltonian, localized energy eigenstates are particularly important." After that, the word "localized" is never apparently used again and hasn't been used prior in the text (these are lecture notes). What does localization mean here? If this is related to linear algebra, I haven't taken it and consequently don't know what it means. I'm having to assume for the current time that localization has to do with whether the energy eigenstate is bounded or not, but I'm not sure.