This means to lack, or have none of something.
CJK Ideographs are characters used in Chinese, Japanese and Korean languages. Their writing systems all completely or partly use Chinese characters.
Japanese “free of Charge” Button was approved as part of Unicode 5.2 in 2009 under the name “Squared CJK Unified Ideograph-7121” and added to Emoji 1.0 in 2015.
🈚 Japanese Sign Meaning “free of Charge”
🈚 Squared CJK Unified Ideograph-7121