| Sign language | Study |
| American Sign Language | [30, 40, 44, 45, 50, 57, 65, 68, 71, 78, 81, 84, 86, 88, 91, 96, 98, 100, 105, 106, 110, 112, 117ā120, 132] | Arabic Sign Language | [51, 101, 103] | Argentinian Sign Language | [114] | Bangla Sign Language | [120, 133] | Brazilian Sign Language | [25, 89] | British Sign Language | [71, 104] | China Sign Language | [88, 93, 128, 138] | Croatian Sign Language | [131] | Danish Sign Language | [48] | Flemish Sign Language | [126] | French Sign Language | [82] | German Sign Language | [36, 47, 99, 123, 129] | Ghanaian Sign Language | [97] | Greek Sign Language | [43, 46, 58] | Hong Kong Sign Language | [122] | Indian Sign Language | [61, 66, 71, 75, 77, 80, 83, 85, 107, 113, 134] | Indonesian Sign Language | [37, 49, 67, 70, 74, 76, 108, 139] | Korean Sign Language | [54, 63, 69, 94, 127] | Malaysian Sign Language | [42] | New Zealand Sign Language | [48] | Pakistan Sign Language | [3, 29, 33, 34, 116, 141] | Persian Sign Language | ā | Russian Sign Language | [86] | Sign language of Netherlands | [55] | Sinhala Sign Language (SSL) | [64] | South African Sign Language | [41] | Thai Sign Language | [27, 59, 92] | Turkish Sign Language | [71] |
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