How many hazard symbols are there?

nineteen

1:highly flammable -a picture of a fire

2:oxidising -a circle with a fire on top of it

3:toxic -a skull and cross bones

4:harmful -a cross with a h in the right corner

5:corrosive -a testube pouring liquid going through someones hand and another through a table

6:irriant -a cross with an i in the right corner

7:polutent -a black river with a dead tree behind it and a dead fish on it

8:explosive -half a circle with the other half disintegrating

9:radioactive -a black spot in the centre with 3 bars around it

10:ionizing radiation -a red background with the radioactive symbol at the top and four arrows coming off it two pointing to a skull and two to a man running

11:non-ionizing radiation -a triangle with a spot on top with three bands on either side of it getting bigger

12: biohazrd -Sorry this one is quite hard to describe so just try typing it in on a search engine.

13:high voltage -a thunderbolt stretching from the top of the symbol to the bottom

14:magnetic field -a horseshoe magnet

15:chemical weapon -a green circular background with a small red radioactive symbol in the middle and three red circles with sticks coming from it

16:optical radiation -a circle in the middle of an eleven point star

17:laser -Yet again this one is hard to explain sorry for the inconvenience.

18:tsunami -a wave heading left to right

19:carcinogenic -a person with a symbolresembling an explosion happening inside their chest

there are also the two generic hazard symbols

1:warnig -a black exclamation mark on a yellow background

2:caution -a black exclamation mark on an orange background