Copy a blank character that apps accept.
An invisible character looks like empty space but counts as real text, so you can use it where apps reject normal spaces: usernames, blank messages, hidden fields and spacing tricks.
The button above copies the Hangul Filler character, the most widely accepted invisible letter. If an app rejects it, the braille blank works too:
A Unicode character that renders as blank space but is treated as real text, like the Hangul Filler (U+3164) or braille blank (U+2800).
Usernames, bios, WhatsApp and Discord messages, and games that reject normal spaces. Acceptance varies by app, so try both characters.