the.com/checklist

means A list of items or steps you work through one by one, ticking each off, so nothing important gets forgotten.

from Straightforward carpentry of English: 'check' (to verify or mark as confirmed, itself from chess's 'check,' the king under threat) plus 'list' (a roll or series of items, from a word originally meaning a strip or border, as of cloth or land). Put together, the compound is a 20th-century practical coinage — aviation and engineering get much of the credit for popularizing it, after cockpit checklists helped pilots stop skipping fatal steps. No myth needed here; it's a word built exactly as plainly as the thing it names.