Arthropods at least all have too many legs.
But iconic plants are
moss and worts
ferns
pines and assorted other conifers
if you have flowers or fruit
there’s monocots - all the cereal crop staff of life
and dicots - the fruit and veg we eat, the flowers we pick.
Oh yes - seaweed - if it is red or green. But not brown.
Ahem. All lumped in ‘plants’ because I as ‘naturalist’ cannot possibly tell them apart, can I?!
However the ‘trivial’ third which is animals is well spread across many icons. (And whimper when I ID as a planty person SO MUCH EASIER to say - that’s a beetle)