| Subject | English | Chinese Taiwan |
| comp., MS | optional attendee | 列席者 (A person who is not required to attend a meeting) |
| comp., MS | optional hyphen | 選擇性連字號 (" A hyphen that is used to control where a word or phrase breaks if it falls at the end of a line. For example, you can specify that the word "nonprinting" breaks as "non-printing" rather than "nonprint-ing.") |
| comp., MS | optional parameter | 選擇性參數 (A parameter that may be specified, but is not required. The program will assume a default value if it is not provided) |