HTML spacing entities

• hair space
    or  
• 6-per-em space
    (no character reference available)
• narrow no-break space
    (no character reference available)
• thin space
    or  
• 4-per-em space
    or  
• non-breaking space
    or  
• punctuation space
    or  
• 3-per-em space
    or  
• en-space
    or  
• figure space
    or  
• em-space
    or