Meaning of the symbol ꓡꓶ [closed]
Solution 1:
Usually $\lfloor x \rfloor$ denotes the floor function of $x$ and $\lceil x \rceil$ the ceiling function. So $\lfloor x \rceil$ probably means that you take the closest integer to $x$.
If this is correct, $\lfloor 1.45 \rceil = 1$ and $\lfloor 1.55 \rceil = 2$ and the case $\lfloor 1.5 \rceil$ depends on the convention.