Which character can assign honeybee and the cockroach to the same phylum?

The Honeybee and cockroach both are

members of the phylum Arthropoda. Arthropods are characterized by having a segmented body with jointed legs and a hard exoskeleton. This phylum is larger than all other phyla combined.

thus the main characteristic is their joined appendages and segmented bodies or presence of exoskeleton.