| Subject | English | Arabic |
| comp., MS | Presence unknown | غير مؤكد التواجد (Pertaining to a user for whom no information is known. The user might not even exist, or there could be a typo in the SIP address) |
| food.serv. | unknown monosaccharides | أحادي السَكَريد غير المعروف/المجهول |
| econ. | unknown quantity | كم غير معروف |