# What does  symbol in ClearAll["Global*"] mean?

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

• It's a backtick. See this. Jun 10, 2013 at 17:27
• It's related to the concept of Context in Mathematica, see this. Jun 10, 2013 at 17:28
• @0x4A4D you are so fast! Jun 10, 2013 at 17:30
• You can learn a bit about the symbol  in a different context than Context, see this: Meaning of backtick in floating-point literal Jun 10, 2013 at 17:36
• Thanks, this is solved. How can I mark one of the comments as an answer? Jun 10, 2013 at 18:54

• and what does that * symbol mean? I see in the documentation that it is used just in the Generalization & Extensions part. But I couldn't find the documentation about it? Sep 20, 2015 at 21:10
• I'm guessing your are asking about the * in ClearAll["Global*"]. That * means zero-or-more-characters. It is documented here under Abbreviated String Patterns. BTW, posting your question as a comment to my answer is most inappropriate. It has nothing to do with my answer and nothing to do with the original question. In the future, please keep your posts on-topic. Sep 21, 2015 at 4:15
• @m_goldberg though to be fair, the question was about what  means in the command ClearAll["Global*"], and your answer mentioned the meanings of  in general but did not discuss its use in this context. Nov 14, 2019 at 18:56