This emoji signifies more than just a school supply; it can also represent 'principles' or 'precision.' Therefore, it can be used metaphorically to describe a methodical or meticulous personality.

In the digital world, its meaning expands to 'standards' or 'evaluation.' For instance, it's used as a warning when someone's actions or words cross a line, or when something needs to be assessed against a specific criterion. You might also see it in humorous contexts, sarcastically referencing overly strict rules.