U+1F17A "🅺" Negative Squared Latin Capital Letter K Unicode Character

U+1F17A "🅺" Negative Squared Latin Capital Letter K is a symbol primarily used in Japanese signage and telecommunications contexts, where it indicates that a payphone or kiosk is compatible with a telephone card. This character is part of the Enclosed Alphanumeric Supplement block and was added to the Unicode standard in version 6.0 released in 2010, representing a negative (white on black) squared variant of the letter K.