pentagrid
Noun
Meaning
pentagrid (plural pentagrids)
(mathematics) A tiling of the hyperbolic plane with regular pentagons
Anagrams
Examples
Multifunction and multisection tubes The pentagrid converter contained five grids between the cathode and the plate (anode).
The pentagrid converter thus became widely used in AM receivers including the miniature tube version of the " All American Five ".