- np - Not proficient: At this level, you may know a few words in the language, but you can't speak in full sentences or - conversationally. If you have this level of proficiency in a language, it may not be helpful to include it in your application materials.
- ep - Elementary proficiency: A person with elementary proficiency may have just started studying and learning the language. They may form some sentences and communicate basic subjects.
- lp - Limited proficiency: Limited proficiency means you understand fundamental vocabulary and social phrases. You can take part in some conversations and understand basic information.
- pp - Professional proficiency: For professional proficiency, you can function professionally by communicating with clients, speaking at a normal pace and understanding specific phrases and idioms. Depending on the position, this level of proficiency may be sufficient for some potential employers.
- fp - Fully proficient: When you are fully proficient in a language, you can take part in or lead advanced conversations about specific subjects like current events and industry standards. If you have this level of proficiency, you may occasionally make pronunciation mistakes or make minor errors when speaking, and many employers consider this level to be acceptable.
- f - Fluent: When you're fluent in a language, you can speak it with close to or the same expertise as a native speaker. This means you have little or no accent and quickly adapt to changes in the language, with an ability to explore specific and nuanced vocabulary.
- n - Native
https://sg.indeed.com/career-advice/resumes-cover-letters/what-is-language-proficiency