It's likely you are thinking of one of the following:
* Phonetic Script: This is a written system where each symbol represents a single, specific sound (phoneme). Examples include the International Phonetic Alphabet (IPA) and some historical writing systems like the Linear B script used in ancient Greece.
* Phonetic Transcription: This is the act of writing down the sounds of a language using a phonetic script, such as the IPA.
* Language with a high degree of phonetic transparency: This refers to languages where the written form closely matches the spoken form. For example, Spanish is considered to be quite phonetic, as the pronunciation of words can generally be determined by the spelling.
It's important to note that no language is perfectly phonetic. Even languages considered to be "highly phonetic" have some irregularities or exceptions in their spelling-to-sound relationships.
If you can clarify what you meant by "phonetic language," I can provide a more specific answer.