coala uses full word prefixes for type, size, importance, and difficulty.

https://github.com/coala/coala/labels

And has a bot that auto labels when the suffixes are used in the issue/PR message.

On Sat, 27 May 2017 05:48 Usman Ehtesham <uehtesham90@gmail.com> wrote:

My vote is on full word prefixes (small words where and when possible)

> On May 26, 2017, at 5:36 PM, Brett Cannon <brett@python.org> wrote:
>
> Something the Rust project does is prefix all their labels with a single letter to have alphabetical sorting keep similar labels together. For instance, using the "T - " prefix to group all type-related label like bugfix, enhancement, etc. This is all done to make it easy to find all labels for a certain thing.
>
> Do people like this idea for labels that don't naturally have a common prefix? If so would people want the single letter prefix or full word prefixes?
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