https://www.telerik.com/kendo-jquery-ui/documentation/api/javascript/ui/inlineaiprompt/configuration/outputactions.icon
outputActions.icon - API Reference - Kendo UI InlineAIPrompt - Kendo UI for jQuery
In this article you can see how to configure the outputActions.icon property of the Kendo UI InlineAIPrompt.
icon apikendo uireferenceinlineaipromptjquery