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I have found an example for clearing all symbol definition by:

ClearAll["Global`*"]

But what does the symbol ` mean? It isn't the apostrophe ', yet it is not documented in Mathematica help.

Jim

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4  
It's a backtick. See this. –  J. M. Jun 10 '13 at 17:27
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It's related to the concept of Context in Mathematica, see this. –  mm.Jang Jun 10 '13 at 17:28
    
@0x4A4D you are so fast! –  mm.Jang Jun 10 '13 at 17:30
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You can learn a bit about the symbol ` in a different context than Context, see this: Meaning of backtick in floating-point literal –  Artes Jun 10 '13 at 17:36
    
Thanks, this is solved. How can I mark one of the comments as an answer? –  JimmyLin Jun 10 '13 at 18:54
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1 Answer

In Mathematica, the back-tick or grave accent ( ` ) is used for two purposes:

  1. As a context mark to delimit contexts (name spaces) in the full name of a variable. Follow this link for more info.

  2. As a number mark to mark the end of an approximate number, and separate the number from its precision value. Follow this link for more info.

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