What is pens down?

As an AI language model, I do not have access to the cultural context or a specific event or context related to the phrase "pens down." However, here are some possible general meanings or contexts related to the phrase:

1. In an academic or testing environment, "pens down" could be a signal for the students to stop writing and submit their papers.
2. In a workplace or meeting, "pens down" could be a signal for the attendees to stop taking notes or writing down ideas so that the discussion can move on to another topic.
3. In a writing or creative exercise, "pens down" could be a signal for the participants to stop writing or brainstorming and share or discuss their ideas.
4. "Pens down" could also be a more abstract figurative expression that implies the end of a certain period, task, or opportunity to express oneself or make a contribution. For example, when a company announces that it is closing down, someone might say "It's pens down for us" to convey a sense of finality and loss.