These names have been used for �dummy� stop controls which do not operate any stop. While Wedgwood characterizes them as �A facetious pleasantry indulged in by some mediaeval organ builders�, Mahrenholz points out that they were often provided for future expansion or for physical symmetry. The names translate as follows: Blinder Zug �blind stop� Ductus inutilis�useless stop� Exaudire "to hear plainly" Manum de tabula"Enough!" Nihil �nothing� Pro forma �for appearance� Reliqua "leftover" Summer Zug �silent stop� Swyger �keep silent� Vacant �missing� Vacat �missing� Vox Inaudita �unheard voice� Vox Ineffabilis�unutterable voice�
No examples are known of any of these names being engraved on stop controls. Contributions welcome.