Go to your emoji keyboard on your phone.
You'll find a clown, a snowman, a taco and a turtle - but you won't find an Aboriginal or Torres Strait Islander flag among the 253 others available for use. This is despite constant campaigning to unicode (who decides on which emojis are released) to make one available. Often you'll see people use as a substitute.
Now while it's not exactly as widely available as the standard emoji keyboard, Twitter has decided to bring the Aboriginal and Torres Straight Islander flags to the platform, using certain hashtags.