In Word 2010, Microsoft added two new features that extend control of Bidirectional (right-to-left language, like Arabic or Hebrew) text:

1. Bidirectional Text Embedding – an advanced feature specified in Unicode Bidirectional Algorithm that solves problem of inserting sentence into a paragraph with different directionality. For e.g., inserting English quote in middle of a right-to-left paragraph. Note: For clarity, in the examples below lower case represents English text characters and UPPER CASE represents right-to-left characters.
   
2. Bidirectional Text Override allows users to force layout of a group of characters to a specific direction regardless of their classification. For e.g., you want to write a part number and you want to ensure that all characters flow left-to-right. This number could consist of numerals and right-to-left characters. Without using overrides, right-to-left letters’ll flow right-to-left, while numbers’ll flow left-to-right and both’ll influence layout of surrounding text.
   
   

   Inserting Unicode Special Characters:

   Using Ribbon:

   1. Position cursor at desired insertion point
   2. Click Insert tab
   3. In Symbol ribbon, click on Symbol icon
   4. From drop down, choose “More Symbols…” to get Symbol dialog box
   5. Switch to “Special Characters” tab
   6. Scroll down to end of list
   7. Select special character you want to insert and click Insert
   8. When you’ve inserted character(s) you need, click Close button to close dialog

   Using Keyboard:

   1. Position cursor at desired insertion point
   2. Type Unicode hexadecimal code for your character (see table in pic).
   3. Press ALT+X
   4. Character code numbers’ll disappear and will be replaced with equivalent hidden special character.

Source:→ Office Global Experience