Gardiner's Sign List is a standard reference list for Egyptian Hieroglyphs. It is divided into sections as follows:
A Man and his occupations
B Woman and her occupations
C Anthropomorphic deities
D Parts of the human body
E Mammals
F Parts of mammals
G Birds
H Parts of birds
I Amphibious animals, reptiles, etc.
K Fishes and parts of fishes
L Invertebrata and lesser animals
M Trees and plants
N Sky, earth, water
NL Lower nile
NU Upper nile
O Buildings, parts of buildings, etc.
P Ships and parts of ships
Q Domestic and funerary furniture
R Temple furniture and sacred emblems
S Crowns, dress, staves, etc.
T Warfare, hunting, butchery
U Agriculture, crafts, and professions
V Rope, fibre, baskets, bags, etc.
W Vessels of stone and earthenware
X Loaves and cakes
Y Writings, games, music
Z Strokes, signs derived from Hieratic, geometrical features
Aa Unclassified signs

You can search by section, by Gardiner's code, symbol, unicode, words in the description, etc.
Some signs have example usage listed. You can also favorite different signs and quiz yourself on them.