Translates as meaning complimentary, or free of charge. For example, a drink that is given "on the house" to a regular customer.
Japanese “Service Charge” Button was approved as part of Unicode 6.0 in 2010 under the name “Squared Katakana Sa” and added to Emoji 1.0 in 2015.
U+1F202
U+FE0F
?️ Squared katakana sa
?️ Variation selector-16