hidden line
Technical term in geometry or computer graphics for a line that is obscured by a surface and normally not drawn.
3Dモデルでは、隠線は通常表示されない。
In a 3D model, hidden lines are usually not displayed.
hidden-line elimination
hidden line and surface removal
Compound of 隠 (in, 'hidden') and 線 (sen, 'line'). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.