pinacols

https://doi.org/10.1351/goldbook.P04674
Tetra(hydrocarbyl)ethane-1,2-@D01748@, R2C(OH)–(OH)R2 , of which the tetramethyl example is the simplest one and is itself commonly known as pinacol (benzpinacol is the tetraphenyl analogue).
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1359 [Terms] [Paper]