I think they mean writing Tu Th Sa Su instead of T T S S (personally I'm a fan of T / theta if I'm doing single-letter abbreviations but Sat/Sun is still not the best)

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lifthrasiir 8 hours ago | parent | next [-]

Maybe we should all adopt Chinese weekday names: Sunday (星期日) remains same, Firstday (星期一) for Monday, Seconday (星期二) for Tuesday, Thirday (星期三) for Wednesday, Fourthday (星期四) for Thursday, Fifthday (星期五) for Friday and Sixthday (星期六) for Saturday. One-letter abbreviations would be simply S, 1 through 6.

	▲	dotancohen 5 hours ago \| parent \| next [-]
		I believe that's how Russian names the days as well. In Hebrew and Arabic we do the same, but Sunday is First Day, Monday is Second Day, etc.
	▲	throwaway5465 7 hours ago \| parent \| prev [-]
		Why downvoted? This is correct.

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card_zero 5 hours ago | parent | prev [-]

Thorn, Þ, seems a more natural choice. The rune is called thurs, even.

I guess there's katakana Sa サ and Su ス, if that's an improvement.