the.com/turnout

means The number or percentage of eligible people who actually show up to vote (or attend some event), as opposed to those merely entitled to.

from A straightforward compound of 'turn' + 'out' — to turn out, meaning to come forth or appear in public. The verb phrase dates back centuries, used for crowds, militias, or workers turning out for a muster or a shift; the noun sense specifically measuring voter or audience numbers became common in the 1800s as elections and public events grew large enough to need counting.