What does [x] mean in graph f(x)=[x]?

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Homework Statement

for an asignment my teacher said graph f(x)=[x] never seen this notation what does [x] mean I treid looking it up on the internet but the search engine didn't recognize the "[]" Thanks!

Homework Equations

The Attempt at a Solution

 

[bp_psy]

Are you sure it wasn't the absolute value sign.f(x)=|x|

 

[GreenPrint]

yes I am

 

[GreenPrint]

ill post the link the teacher put it up on the web

 

[GreenPrint]

http://www.windsorct.org/schools/windsorhigh/AP/documents/10.06_Pointek_summer_assign.pdf

number 82

 

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last page

 

[bp_psy]

http://en.wikipedia.org/wiki/Nearest_integer_function

 

[GreenPrint]

floor celling notation... um... maybe?

 

[GreenPrint]

http://en.wikipedia.org/wiki/Nearest_integer_function

Thank You