Option Key Shortcuts

You probably know that holding Option will allow you to type special characters not normally accessible. Knowing what secondary character each key corresponds to is a higher accomplishment. Here are several of the more useful alt-keys, available on a US English keyboard:

        Alt-1 -> ¡ (upside-down !, used in certain languages)
        Alt-2 -> ™ (trademark symbol)
        Alt-3 -> £ (pounds)
        Alt-4 -> ¢ (cents)
        Alt-5 -> ∞ (infinity)
        Alt-6 -> § (section symbol; used in MCBE formatting codes)
        Alt-8 -> • (dot)
        Alt-0 -> º (degrees, temperature or geometrical)
        Alt-T -> † (used as a secondary footnote marker)
        Alt-Y -> ¥ (yen)
        Alt-P -> π (pi)
        Alt-G -> © (copyright)
        Alt-X -> ≈ (approximate equals sign)
       Alt-<> -> ≤≥ (equal or lesser/greater)
        Alt-? -> ÷ (division sign)
  Shift-Alt-2 -> € (euros)
 Shift-Alt-34 -> ‹› (arrow brackets)
  Shift-Alt-K ->  (private use Apple logo)
  Shift-Alt-N -> ˜ (combining character; joins with previous letter)
  Shift-Alt-? -> ¿ (upside-down ?)
        Alt-\ -> « (double arrow)
  Shift-Alt-\ -> » (other double arrow)

(Characters were tested on an Apple device with an external US English keyboard; not guaranteed to work on other operating systems)