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There is no special symbol to indicate an irrational number.
To indicate something you don't understand
The symbol that you describe seems to be the greek letter Phi. It is normally used to indicate a variable that is an angle, just as x is used to indicate a variable that is a numeric quantity.
Rectangles
the symbol for No fewer then is > because this symbol means that it can both be greater then and equal to.
The backslash proofreading symbol is used to indicate a space that should be deleted, especially in typesetting or formatting work. It signifies that the space preceding the backslash should be removed to ensure proper formatting and alignment of the text.
There is no backslash proofreading symbol in existence, for more information on all the proofreading symbols, refer to this page: http://webster.commnet.edu/writing/symbols.htm
There is no backslash proofreading symbol in existence, for more information on all the proofreading symbols, refer to this page: http://webster.commnet.edu/writing/symbols.htm
strike through
The proofreading symbol for using a lowercase is a caret (^) underneath the uppercase letter that should be changed to lowercase.
it indicate where and what to drop in
When looking to find easy to read charts that show proofreading symbols then it may be worth checking out websites such as Graphic Design Employment that offer free easy to use free proofreading symbol charts.
What does this symbol indicate on a weather map? low pressure
capitalize the letter:Place three lines underneath the letter that needs to be capitalized.
In proofreading, the symbol used to show where a new paragraph should begin looks like: ¶.
A monovalent cation; the symbol is I (Roman).
The plus symbol, "+", is used to indicate an addition.