On Linux: press CTRL + Shift ⇧ + U and enter the number below. On Windows, search for the “alt codes”. Symbols in grey may show up as ▯ on Android.
In HTML, to force rendering actual black and white unicode symbols and not emojis*, type the symbol's hex code followed by the variation selector “︎”. Unfortunately this doesn't work on Android for many symbols, such as the two below, but which are discerned correctly on Linux (if e.g., font noto-fonts-emoji is installed) and Windows; Why?
For example, to draw:
🌪︎ and not 🌪️, type: 🌪︎
🐿︎ and not 🐿️, type: 🐿︎
Non-exhaustive lists of symbols/emojis:
EmojiCopy, all emojis as sprites, web fonts, and native fonts. [On Linux, without additional fonts installed, select native to see which emojis are available in black and white.]
“Emoji Presentation Sequences, v15.0”, the exhaustive lists of symbols that can be rendered in black and white with the variation selector 15 (VS15).