Keywords: opportunity, chance, appearance, pop up, appear

Found 2 variants for this sign (click on video to enlarge):

Sign Definition

As a Noun

1. A situation in which it is possible for something to happen, especially a situation which is unexpected and beneficial. English = opportunity, chance.
2. The arrival of someone somewhere, especially unexpectedly. English = appearance.

As a Verb or Adjective

1. To take place without planning and unexpectedly. English = pop up, appear.
2. To be present unexpectedly at a place. English = pop up, appear.