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I came across the term primordial binary in the article Stellar Collisions During Binary-Binary and Binary-Star Interactions by JM Fregeu:

"The realization during the 1990s that primordial binaries are present in globular clusters in dynamically significant numbers has completely changed our theoretical perspective on these systems"

But what is a primordial binary? I don't think it means primordial black hole, which is what came up when I searched for it. Maybe a type of binary system that's really old (comparable to the age of the cluster)? I'm just not sure.

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It just means a binary formed as part of the initial star formation process, as opposed to one formed later in some sort of stellar interaction.

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