What is the value of [3.6]?

If those are absolute value bars it's 3.6 because absolute value always excludes the negative sign. So since there's no negative symbol it's just 3.6

3

Step-by-step explanation:

[ 3.6 ] represents the greatest integer function [ x ]

If x is an integer use that integer

If x is not an integer use the next smaller integer

[ 3.6 ] is not an integer, hence

[ 3.6 ] = 3