Hidden Symbols that can be made with keyboard keys

Press given keys to create symbols

Alt + 0153:   ™  (trademark symbol)
Alt + 0169:    ©  (copyright symbol)
Alt + 0174.:   ®  (registered trademark symbol)
Alt + 0176 :    °   (degree symbol)
Alt + 0177 :    ±   (plus-or-minus sign)
Alt + 0182 :    ¶    (paragraph mark)
Alt + 0190 :    ¾   (fraction, three-fourths)
Alt + 0215 :    ×    (multiplication sign)
Alt + 0162:     ¢     (the cent sign)
Alt + 0161:     ¡      (upside down exclamation point)
Alt + 0191:    ¿      (upside down question mark)
Alt + 1:         ☺      (smiley face)
Alt + 2:         ☻     (black smiley face)
Alt + 15:       ☼      (sun)
Alt + 12:        ♀      (female sign)
Alt + 11:        ♂       (male sign)
Alt + 6:          ♠        (spade)
Alt + 5:          ♣       (Club)
Alt + 3:          ♥       (Heart)
Alt + 4:           ♦      (Diamond)
Alt + 13:         ♪      (eighth note)
Alt + 14:         ♫     (beamed eighth note)
Alt + 8721:     ∑     (summation (auto sum))
Alt + 251:       √      (square root)
Alt + 8236:     ∞      (infinity)
Alt + 24:         ↑      (up arrow)
Alt + 25:         ↓      (down arrow)
Alt + 26:.        →    (right arrow)
Alt + 27:         ←    (left arrow)
Alt + 18:         ↕      (up/down arrow)
Alt + 29:         ↔    (left right arrow)