| Subject | English | Korean |
| comp., MS | optional attendee | 선택 참석자 (A person who is not required to attend a meeting) |
| comp., MS | optional hyphen | 사용자 지정 하이픈 (" 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 | 선택적 매개 변수 (A parameter that may be specified, but is not required. The program will assume a default value if it is not provided) |
| comp., MS | optional section | 옵션 구역 (A control on a form that contains other controls and that usually does not appear by default. Users can insert and remove optional sections when filling out the form) |