Objects instantiation - variable value

Hello,

I am curious about what is the number in an object value for... (when in debug mode).

Example:

What is the number 13 for? Is that a pointer to the object?

I am creating an object like this:

TRY.
      CREATE OBJECT ob_inb_dlvry
        EXPORTING
          i_vbeln = lips-vbeln.
    CATCH cx_root INTO ex_ob_cx_root.
      ex_text      = ex_ob_cx_root->get_text( ).
      ex_text_long = ex_ob_cx_root->get_longtext( ).
endtry.

When in debug mode my object looks like this:

Variable: ob_inb_dlvry
Value: {O:13*\CLASS=ZCL_INBOUND_DELIVERY}

What is the number 13 for? Is that a pointer to the object?

Your response is greatly appreciated! Thank you very much in advance.