A saved list stores your filter set rather than a frozen snapshot, so it reflects the current market whenever you open it. That makes lists the natural unit of organisation for a team, and it makes naming them properly worth the ten seconds it takes.
A scheme that holds up as the workspace grows is geography, segment, size, role:
DACH - Manufacturing 200+ - CFOUK - Accounting firms 1-50 - OwnerNordics - Logistics 51-200 - Ops Director
Three rules make the difference. Put geography first, because it sorts naturally and it is the thing you filter for mentally when you scan the Lists page. Encode the size band in the name, since size is the filter people most often forget they set. And avoid names that describe a campaign rather than a segment, like Q3 push, because the list will outlive the campaign and nobody will remember what was in it.
Keep one list per segment rather than one per send. When a campaign starts, export a fresh slice from the standing list. The list stays a definition of a market, and the exports are the point-in-time artefacts.