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@zacts
again, you have quite a few ways to do it.

please do check this page
http://ergoemacs.org/emacs/emacs_n_unicode.html

more specifically, use one of the following method:

• Emacs: Abbrev Mode
http://ergoemacs.org/emacs/emacs_abbrev_mode.html

• Emacs: Xah Math Input Mode
http://ergoemacs.org/emacs/xmsi-math-symbols-input.html

which to use depends on how often you type those chars, in what context.