Your primary use(s) is/are:
a) to ward off evil
b) to protect
c) to wear
d) to write with
e) to keep in your wallet
f) to use outdoors
g) to use indoors
h) to be combined with an inventory object
i) to use in/with your hands
j) to eat/drink or to eat/drink with
k) to gain knowledge with
l) to read
m) to hold something
n) to create a chemical reaction with
o) to be held in the hand
p) to be hung on a wall
q) to be turned on or off
r) to be opened or closed
s) to be looked in, at or through
t) to help solve a mystery
u) other, please specify without giving too much away!