Emacs Special Chars

• Special Characters can be inserted by typing C-q KEY or C-q ONR, where KEY is a key like return or tab, and ONR is an octal representation of some character.
• also consider using the iso-accents-mode (typing /e results in æ!) and TeX Input Method (\leadsto results in ↝).
• Inserting single characters by decimal code: M-x insert-ucs-character RET 8704 results in ∀.

Using input Methods

Selection and Switching

• Chosing an input method: C-u C-\
• Switch / Toggle input method: C-\

Useful Input Methods

TeX

for using LaTex-like input sequences, e.g. \forall, \exists, \in, \ne, \equiv etc.

cyrillic-jсuken

Russian keyboard layout -- but this assumes, that you originally have an american keyboard layout, if your X-keyboard layout is e.g. german, then the resulting russian keyboard layout is not correct! Therefor it's actually better to just change the keyboard layout with C-x C-m k russian-koi8 or so...

Unicode

Dave Love's 'ucs-tables.el' has this command ucs-insert "Insert the Emacs character representation of the given Unicode. Interactively, prompts for a hex string giving the code."

∈ □ ⊓ Σ ⋐ ∠ ø ← → ⇒ ⇐ ²