Keycap: # #️⃣

The keycap hashtag displays as a # symbol enclosed in a square box, styled to resemble a physical key on a keyboard or phone keypad. The design typically renders in black and white with a clearly defined border, maintaining that classic "button" appearance across platforms.

This symbol functions primarily as a marker for hashtags—the organizing mechanism of social media. People use it to categorize posts, make content discoverable, and join conversations around specific topics. On Twitter, Instagram, and TikTok, the hashtag keycap appears organically when you type "#" followed by text, and users often include multiple hashtags to increase visibility and reach.

Beyond social media organizing, the hashtag symbol represents connection and collective conversation. When someone uses a hashtag, they're signaling participation in a broader community—whether that's #BlackLivesMatter for activism, #FYP for TikTok visibility, or #MondayMotivation for life advice. The keycap rendering adds a nostalgic, retro quality that feels like pressing a button from older technology.

The keycap hashtag was approved as part of Unicode Emoji 0.6 in 2010, making it foundational to modern emoji communication. Its appearance remains consistent across platforms, maintaining that satisfying tactile button-like quality that feels purposeful and intentional.