Contest that no one plays

I’m trying out a new feature on this site, a contest.  If successful I’ll make it a monthly feature.  Win a US$5 bill by answering the following question correctly:  In what field of study would you encounter the following expression, and what (roughly) does it express?  You will need a non-text-based browser to view it properly.

π4*2A4B-C4 (C3+Χ2) D-G4 (±G2) H4 (–H2.3,=*2)

Post your answers here or email them to me.  Winners will be announced on mcgees.org.

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