sql - Store "greater than or equal to" symbol in Oracle varchar2 column -

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I have a varchar2 (255) column that I would like to store as a string: 

  1 â ?? ¤2   
 However, when I run the following sql ?? ¤ symbol turns into a "=".  
  update my_table set my_column = '1â ?? ¤2 ';   
 This is the result in the following values ​​in my table:  
  1 = 2   
 How do I store the database In â ?? ¤ or â ??   
 
 
 Use UTF 8 to store data It is not as convenient as a plain string, But it avoids errors caused by customers not interpreting UTF 8 properly.  
  - â ?? ¥ Select unistr ('1 \ 2265 2') from dual; - ?? ¤ Select from the electorate ('1 \ 2264 2');

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