The ditloid "850 B P in L" stands for "850 Beers Per In Liters." It refers to the number of beers that can fit in a certain volume, specifically measuring beer capacity in liters. This type of puzzle often uses numbers and initials to convey a phrase or concept.
49 Balls in the Lottery (UK)
River Boyne 112 kilometres long.
20 10 in B T the L are G B
3 Way Light Bulb
who recorded the song 200-3AB
17 yak liquorish
2 Little Dickie-Birds Sitting on a Wall (One Called Peter, One Called Paul)
motorway speed limit in britain 70 Maximum Speed Limit in Britain
5 small barley loaves and two small fish (Miracle in Gospel of John)
50 is L in Roman Numerals
The ditloid "30 S L A T" stands for "30 seconds left on a timer." Ditloids are word puzzles where numbers and letters represent a phrase, and in this case, the letters correspond to the words in the phrase related to a countdown or time measurement.
12 Lines on the Underground