I don't know, but my gut assumption is it's code for "new atheist". Which, as an atheist, I feel obliged to point out means they're not any more likely to actually be rational in general than anybody else.
Also, your icon is way more fascinating when we mix up the subjects and predicates. Romeo and Juliet are his sled. Soylent Green was earth all along. The psychologist is Darth Vader's father.
Just for a bit of a twist, my brother is somewhat involved in the Rationalist community, and he is a Christian. But I think your assumption that rationalist and atheist usually go together is correct.
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