I have a recipe that asks for "a ladleful" of something. The recipe book usually uses imperial weights and volumes, that I can convert to my metric units that I hold so dear.
As I understand it, a ladleful is the volume necessary to fill a ladle - but how much is it? A ladle can take on various sizes, so I guess it wouldn't make much sense to not normalize it in any way (like, a cup is eight ounces).
EDIT: As suggested in the comments, I want to mention it is "a ladleful of sourdough starter" that I should add to 2 pounds 7 ounces / 1.1 kg of rye flour and 2.5 cups of water. I'd normally go with about 500g of starter, but that seems like a big ladle to me.