Prawns and hermit crabs can stand for isolation and loneliness. Represent the sea, the underwater world or also food. Could also mean: You only move sideways!
The crab emoji was introduced in 2015 and released as part of the Unicode 11.0 standard. This emoji can be found under the food and drink
category. Because the crab emoji has been around for quite some time, it should display correctly in the majority of operating systems.