What are the names of the L-shaped brackets and what do they mean?

Question

Mathematics

I don’t know how to describe them more clearly, they are written as vertical inversion symbols. Couldn't find it in math notation.

Answer 1

Integer part "bottom", "floor". Rounding down to an integer. An analogue of the floor function.
https://ru.wikipedia.org/wiki/Whole_part#Denotation...