As the name suggest this segment of Process contains only name and size but not the value as value of the symbol is supposed to be zero.
BSS is used by many compilers and linkers for a part of the data segment containing statically-allocated variables represented solely by zero-valued bits initially (i.e., when execution begins). It is often referred to as "BSS segment".
Typically only the length of the BSS section, but no data, is stored in the object file. The program loader allocates and initializes memory for the BSS section when it loads the program. Operating systems may use a technique called zero-fill-on-demand to efficiently implement the BSS segment.
