How to find the size of a field

Can somebody tell how to find the sie of a varchar2 field?
Thanks.

SQL> desc global_name
Name Null? Type
GLOBAL_NAME VARCHAR2(4000)
SQL> select global_name from global_name;
GLOBAL_NAME
ITFD.XXXXX.CO.XX
1* select vsize(global_name) from global_name
SQL> /
VSIZE(GLOBAL_NAME)
16

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