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I've seen the word "spike" used in relation to source-control.

For example, a project I'm working with has three top-level folders: trunk, branches and spikes.

What's the meaning of this term?

+7  A: 

"Spike" is a synonym for "Tag". It is a "spike" in the ground meaning it doesn't move versus a branch, which grows.

For further clarification, a 'tag' or 'spike' represents a release version of your project. Tags are snapshots of that release and as such are not actively developed on though branches can be created from a tag and then further developed.

Burly