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AAQKBgAAH6CYJECBAgIAA+wECBAgQIBAICHCAbpIAAQIECByxcQFpoRMBzwAAAABJRU5ErkJggg==The variable "i" inside the FOR block is declared to be an "upvar," which means that it's passed /up/ to the caller. In the block in the palette (down at the bottom of Control, not the primitive version near the top), it has the same name as inside the definition of FOR, but the user can click on it to change its name, as I've done in the nested FOR blocks at the top left of the scripting area. Each of the two nested invocations of FOR has its own index variable. Because there's only one copy of the FOR source code, those two variables have the same name "i" inside the body of FOR, but they have different names in the body of the nested loops (the SAY instruction). So with respect to the code in the Block Editor, there are two variables, both named "i", one for each FOR invocation. But if you look at only one invocation, it has a single index variable, whose name is "i" inside the FOR body, but whose name in the user's code is "I" or "J" depending on which loop you mean.^ Right-click on a FOR block | above and choose "Edit..." | from the menu.