The list of icons you can find here: https://docs.telerik.com/kendo-ui/styles-and-layout/icons-web#list-of-font-icons
To use an icon in the custom command button, an additional class ("k-icon") is needed. For example, to display the filter icon IconClass should be set like this:
columns.Command(command => command.Custom("DetailsCommand").IconClass("k-icon k-i-filter").Click("showDetails"));
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