How do you call a ticket/feature that is some kind of improvement or small feature?

I want to label all the tickets of this type in Jira so I can find them later.
During development, I am usually creating improvement tickets sometimes a tech debt or small feature that will help in development or in the app itself. I want to label them and keep them in backlog, then whenever my team has a chance to work something I want to quickly filter all tickets by this label and feel in the gap of missing tickets in the Sprint.

So I am looking for a suitable name for this type of ticket.