Here's a list of things that I regularly use
Building materials:
trees-wood (yew, ash, oak, maple, cedar, pine)-lumber
stone-blocks
marble-limestone-travertine-bluestone
ore-iron-steel
sand-lime-ash-glass
Food resources:
wheat-grain-flour-beer/ale-bread
vegetables-corn-tomatoes-spinach-cabbage-potatoes-onions
cows-dairy (milk, cheese, butter)-meat-leather
pigs-hams-bacon
sheep-wool-dairy
goats-dairy
olives-olive oil
grapes-wine
spices
deer-fur-meat
chickens/ducks/geese-feathers-eggs-meat
salt
fish
Clothing resources:
bear-fur
beavers-fur
flax-linen-paper
cotton-clothing
hemp-burlap-rope
exotic animals (tigers, minks, elephants, etc)-fur/ivory
whale-blubber-oil
seal-furs-blubber-meat
walrus-fur-meat-ivory
silk
Natural resources:
gems-jewelry
gold-silver-copper
peat
coal
oil
papyrus-paper
flowers-perfume
clay-pottery-ceramics
Finished/Trade resources:
armour
weapons
shields
bows-arrows
crossbows-quarrels
furniture
bottles
magic supplies
boats/ships
barrels
carts/wagons
slaves
books
horses
ink
pearl
tobacco
shoes
tools (hammers, axes, saws, nails, screws, chisels, planers, etc)
artsy things like paint/paintings, sculptures, tapestries/rugs, music, etc.
Creatures:
wolves-cougars-jaguars-lions-tigers-snakes-bats-other common creatues
giraffes-gazelles-elk-moose, etc
rhinos-hippos-mammoth-mastodon
dinosaurs (t rex, triceratops, raptor, pterodactyl, apatosaurus, stegosaurus, ankylosaurus)
eagles-hawks-falcons-owls
orcs-ogres-trolls-goblins
elves-dwarves-gnomes-faeries
dragon-drake-wyrm
elementals-constructs
sea monsters (giant squid, octopus, megalodon, ichthyosaurus, dolphin, shark, piranha, barracuda, swordfish, sailfish, penguin, jellyfish, crocodile, eel, various shells)
pretty much every creature/monster out there depending on the setting
Sites:
ruins
shrines-temples-churches-cathedrals-basilicas
abbeys-nuneries
windmills/watermills
caves
pyramids
obelisks
citadels-palaces-castles-keeps-motte and baileys
villages-towns-cities
dungeons
henges
towers
Miscellany:
skull and crossbones
x marks the spot
bridge
grotto
enchanted pool
whirlpool
tornado
lightning
cloud
rain
wind
air-earth-fire-water
column/pillar-broken column/pillar
gravestone-cemetery
haunted house
arena-circus maximus
colossus
totem pole
teepee
voodoo/tribal masks
crossed swords on shield-spears-halberds-various weapons
Styles for icons depending on setting:
European (English, French, German, Slavic)
Mediterranean (Minoan, Cretan)
Greek/Hellenistic
Egyptian
Chinese (Buddhist)-Japanese (Shinto)
African (Zulu)
Indian-Hindu
American Indian-Inuit
Norse
Arthurian
Celtic
Polynesian
Aztec/Incan/Mayan
Arabic
Judaic
"Orcish"-"Elfin"-"Dwarven"-etc