A square shown in the color of green. May be used to represent anything green.
May 2021: Sometimes shown in Twitter names in support of Taproot, a Bitcoin fork (potential feature change) that would allow additional privacy measures for transactions.
Green Square was approved as part of Unicode 12.0 in 2019 under the name “Large Green Square” and added to Emoji 12.0 in 2019.
U+1F7E9
? Large green square