Karl

"“We are pleased that LSST has now been named the Vera C. Rubin Observatory,” said Rubin’s sons Allan Rubin, David Rubin, and Karl Rubin in a statement."

"Whatever its object the runrig system was not udal tenure, and therefore it appears to me to show a settlement of the unfree. Whether these were the karls or the thralls is the only problem, and I incline to think that there is little room for doubt that these were the karls. The thrall may have had a scrap of ground and kept pigs, but there is no evidence that he had agricultural land. In short the modern cottar is the descendant of the thrall and the crofter of the karl."