It was a short way of writing a different spelling of the words all correct. Some foreign-born people wrote all correct as o-l-l k-o-r-r-e-c-t, and used the letters O.K.

VOA: special.2010.02.28

The markets are saying they're going to go all the way back to one, which was the low for short-term rates.

市场正在表明,他们将会全力以赴回归到，短期利率很低的时代。

耶鲁公开课 - 金融市场课程节选

The markets are saying they're going to go all the way back to one, which was the low for short-term rates.

市场正在表明,他们将会全力以赴回归到，短期利率很低的时代。

耶鲁公开课 - 金融市场课程节选