moreover, also, furthermore
且 centers on adding information or emphasis: moreover, also, furthermore. It marks an additional point or a stronger statement in a sequence.
The historical origin of 且 is uncertain. It may have originally depicted a pile of objects or an ancestral tablet, but its modern use as a grammatical particle for 'moreover' is a later development.
The shape 且 resembles a stack of blocks with a flat base, like adding one more block on top of another. Think of it as piling on extra information: moreover, also, furthermore.
For ショ, imagine a show host adding one more act to the lineup: 'And furthermore, we have...' The word 'show' cues ショ while the host keeps adding more.