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51:1 ·
This is a common ideogram in modern Western systems. As a sign used in trade and commerce it means number. It is also common on computer printed forms.
In musical notation it is called a sharp and indicates that one should raise a half tone. Another, similar sign,  , means cancel the raised half tone or cancel the lowered tone indicated by  .
The sign  has also been used in early chemistry to denote air.
In medicine the sign is sometimes used to indicate a fracture, i.e. a broken bone.
For the meaning and use of on telephone keyboards, see  in Group 45.
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