龖----《汉语大字典》解释此字说：二龙、三龙均音dá，龙行貌。四龙音zhé，义为“唠唠叨叨，话多”，并认为四龙是“詟”的异体字。《说文言部》：“詟，一曰言不止也。”（据《咬文嚼字》） 龘：古同“龖”，龙腾飞的样子。
英文单词有1913个字母，实际上是一个蛋白质叫“色氨酸合成酶”（tryptophan synthetase）。
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