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In page Eton College:

"

King's Scholars are entitled to use the letters 'KS' after their name and they can be identified by a black gown worn over the top of their tailcoats, giving them the nickname 'tugs' (Latin: togati, wearers of gowns); and occasionally by a surplice in Chapel. The house is looked after by the Master in College. Having succeeded in the examination, they include many of the most academically gifted boys in the school.[citation needed]