squared cjk unified ideograph-7121 symbol.
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Japanese “free of charge” button was assigned codepoint in Unicode 5.2 on 01 October 2009.
Japanese “free of charge” button was included in Emoji 1.0 on 04 August 2015.
🈚 U+1F21A
:u7121:
🈂 Japanese “service charge” button
🉑 Japanese “acceptable” button