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A few days ago I was answering Comparing two fields and printing result as 1 (if number matches) or 0 (if not) using Python Parser of ArcGIS Field Calculator?

When describing the process required to get the result using the Codeblock I talked about the "Pre-Logic Script Code", but then didn't know what to call the next box in the window, so I just said

and in the bottom section enter e

What is that bottom section actually called, so I can use the right term?

[What do I call the circled field?]

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Function call box? Guessing... – FelixIP Mar 13 at 3:47
up vote 3 down vote accepted

I've always referred to the bottom box as the "Expression Box". In fact if you look at the help, it is referred to as an "expression". For example:

In the tool dialog box, an expression can be entered directly into the Expression parameter, or interactively built using the Field Calculator.

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I just call it the expression too – PolyGeo Mar 13 at 6:35
thanks, that makes sense – Midavalo Mar 13 at 18:57

This is simply called "Expression". And you can refer to it by saying

Provide definition in Pre-Logic Script Block and then Use checksum( !Numbers!,!data_all! ) as expression

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