Icons for telling someone that something is really slow or super fast. For example: an aerial platform can be set into "slow" or "fast" movement. Iconifying this means that a switch can be set into snail/rabbit mode, or turtle/hare mode. I have seen it on several machines, so it must be a "defacto standard". Other use for turtle/rabbit combination is: http://en.wikipedia.org/wiki/The_Tortoise_and_the_Hare Snail
Hare/Rabbit icon: [already present in icons8 set, see \Animals\rabbit\]
Maybe it is better when the rabbit is depicted in a running state, so that it depicts fast movement. Is it possible to combine these icons:
a) the already present rabbit icon in the icons8 set (that's a nice icon!)
b) the rabbit in running mode:
c) adding racing stripes to the icon, just like it is done with the "run_command" icon:
The snail and turtle/rabbit/hare icon can be used both for depicting "slowness".