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What does "I" mean IP route?

When you do an IP route on a Cisco Router and you see an "I" beside the route, what does that mean? I think that it stands for IS-IS protocol. What I don't understand is where did get that route from? Did someone type it in?
No one types it in. Routing algorithm raises a flag for each route so that routing engine can understand which route is being learned from what source. If you see the flag you will not understand it. So OS converts it to a presentable form which in this case is I for Is-IS.

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