negative acknowledgement
Subject: DATA / Computer networks
| Language | Term |
| Arabic - AR | إشعار استلام سلبي |
| DE - German | negative Bestätigung |
| EN - English | negative acknowledgement |
| ES - Spanish | acuse de recibo negativo |
| FR - French | accusé de réception négatif |
| JA - Japanese | NACK |
| KO - Korean | 부정응답 |
| RU - Russian | отрицательное подтверждение |
| ZH - Chinese | 否定应答 |