Linguist Roman Jakobsen attempted to break these down into individual features. In some languages, such as Thai, but not in English, these units can be distinguished from each other by aspiration, and ones of these that are differentiated from each other but represented the same way are called allophones. One example of one of these is the "guh" sound in the word "dog". Usually represented in pronunciation guides between 
Linguist Roman Jakobsen attempted to break these down into individual features. In some languages, such as Thai, but not in English, these units can be distinguished from each other by aspiration, and ones of these that are differentiated from each other but represented the same way are called allophones. One example of one of these is the "guh" sound in the word "dog". Usually represented in pronunciation guides between backslashes, for ten points, identify this unit of language, the smallest unit that can differentiate between meanings.
Linguist Roman Jakobsen attempted to break these down into individual features.
{phoneme}