the.com/playpen

means A small portable enclosure with mesh or slatted sides that gives a baby or toddler a safe, contained space to sit and play without wandering off.

from A straightforward 20th-century compound of 'play' plus 'pen,' the same 'pen' used for an animal enclosure (as in sheep pen or playpen) — a word that traces back to Old English 'penn,' meaning a small fenced area. The figurative use of 'playpen' for any restrictive-but-cushy space (like an easy job or a soft political arrangement) grew naturally out of the literal baby-containment device once it became common household furniture.