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 โFree of Chargeโ Button was approved as part of Unicode 5.2 in 2009 under the name โSquared CJK Unified Ideograph-7121โ and added to Emoji 1.0 in 2015.
๐ Japanese Sign Meaning โFree of Chargeโ