Bitwise union (or)
The bitwise union or produces a result by comparing all 64 bits of its left and right operands, which must be expressions of type integer, one bit at a time. For each bit in the two operands, the corresponding bit in the result value is set to 1 if either or both operands bit values is 1 and set to 0 if both operand bit values are 0.
Example
The following illustrates this using 64-bit binary values.
a := 42;0000000000000000000000000000000000000000000000000000000000101010
b := 642; 0000000000000000000000000000000000000000000000000000001010000010
a or b 0000000000000000000000000000000000000000000000000000001010101010