olemus
kontekstist sõltuv lame element
= a context-dependent flat element

Wiktionary:
1. a (usually) rectangular section of a surface, or of a covering or of a wall, fence etc.
5. (graphical user interface) a type of GUI widget, such as a control panel

näiteid
front panel -- esipaneel
panel house -- paneelmaja
solar panel -- päikesepaneel
tube panel -- torupaneel

vt ka
- juhtpaneel
- kommutatsioonipaneel
- koondpaneel
- paneel (2)