Tad, I assume you are refering to Maryland rules. (your location says Del.)
In the rules, the definition for traps and pots are;
B. Recreational Gear—Definitions.
(1) The gear defined in this section may be used to catch crabs for recreational purposes.
(2
) "Collapsible crab trap" means a manually operated, portable device:
(a) Having a flat bottom not more than 20 inches by 15 inches, and not more than four articulated sides; and
(b) Designed so that failure to apply manually exerted tension on the closing mechanism allows the crabs to escape. (3) "Crab net ring" means netting supported by a ring-shaped rim less than or equal to 30 inches in diameter.
(4) "Crab pot" means a cube-shaped or rectangular shaped device with openings toward the inside for the entrance of crabs. (5) "Dip net" means a mesh bag of netting or wire which is suspended from a circular, oval, or a rectangular frame attached to a handle.
(6) "Handline" means a fishing line managed primarily by hand.
(7) "Trotline" means a length of rope or line, buoyed at both ends with one or more anchors, which is baited without hooks or snares at intervals for the purpose of catching crabs.
(

"Seine" means an encircling type of net which is not more than 50 feet long and 5 feet wide.
Hope this helps.