XΘX

XΘX [ex·thay·tah·chi] n. a tongue-in-cheek Greek-letter hybridization or nickname meaning ex-Theta Chi (house), an on-campus house (defunct fraternity house) formerly known as Theta Chi (Greek: ΘX) that was taken over by ex-members, etc. after the fraternity was evicted.

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NOTES: Apparently, the national Theta Chi fraternity does not enjoy Stanford humor as it has brought a lawsuit against the university for among other things "misappropriation of its name."