Nowadays, there are these convenient icons in ModelBuilder. However, their meaning is not always clear to me. Is there perhaps a poster or some other resource in which all the symbols are clearly explained?
I found the link below, but the images are not very clear.
https://pro.arcgis.com/en/pro-app/latest/help/analysis/geoprocessing/modelbuilder/modelbuilder-vocabulary.htm#GUID-6E4F6F17-F6CF-473D-BAFA-198643CA8321
We will update the doc to add some resources related to icons, but this can be an exhaustive list as things get added release by release. However as a general rule, the icons on variable usually represent the data type of the variable and type of tool (system/modelbuilder specific tools such as iterators/utilities/logical/ or script tools. Hope this helps a little.
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