Number 21 Icon - Green Square Design for UI or Signage #191873 (License: Personal Use)

This image shows a vibrant green, rounded-square icon with the numerals "21" rendered in a bold, sans-serif white font. The design emphasizes clarity and legibility, with generous padding and high contrast between foreground and background. Its style is consistent with modern transit signage, app UI elements, or numbered list markers.

Commonly used in public transport systems (e.g., bus or train route numbers), digital dashboards, educational flashcards, or as a visual marker in step-by-step guides. Matches user intent for quick recognition of the number 21 in structured visual contexts.