For example, whenever you have a color display you might want to render balances for a bank account as black Numbers if they are positive, and as red Numbers if they are negative.

例如，如果有彩色显示器时，可能想用不同颜色来表示银行帐户的余额，如果余额为正，则用黑色数字，如果余额为负，则用红色数字。

youdao

We see an electronic sign with red numbers near Massachusetts Avenue.

VOA: special.2009.09.21

In the past, numbers in the financial records of a company were written in red ink to show a loss.

VOA: special.2009.04.26

At the entrance to the bar, Kazuhide Asaba has contributed a contemporary piece from his personal collection: a futuristic black sculpture flashing red LED numbers by the artist Tatsuo Miyajima.

FORBES: Ryokans Beyond Calm

Brady's red-zone numbers, in particular, were considerably better when throwing to Gronkowski when compared to his other targets.

WSJ: An NFL Season Hinges on Rob Gronkowski's Ankle

The numbers flash red, yellow or green depending on whether the company is meeting its goals.

FORBES: LivingSocial To Overtake Groupon With $400M: LivingSocial Investor