| Subject | English | Tswana |
| comp., MS | not a number | ga se palo (A value that represents the result of an invalid calculation) |
| comp., MS | not applicable | ga e dirisiwe fa (Pertaining to something for which an answer is not available or appropriate) |
| comp., MS | not valid | Ga e a siama (Erroneous or unrecognizable because of a flaw in reasoning or an error in input. Invalid results, for example, might occur if the logic in a program is faulty) |