Traditional American system Counts the beat number on the tactus, & on the half beat, and n-e-&-a for four sixteenth notes, n-&-a for a triplet or three eighth notes in compound meter, where n is the beat number.[7] 

  In music, #counting is a system of regularly occurring sounds that serve to assist with the performance or audition of music by allowing the easy identification of the beat. Commonly, this involves verbally counting the beats in each measure as they occur, whether there be 2 beats, 3 beats, 4 beats, or even 5 beats. In addition to helping to normalize the time taken up by each beat, counting allows easier identification of the beats that are stressed. Counting is most commonly used with rhythm (often to decipher a difficult rhythm) and form and often involves subdivision (elaborated on in later passages).  

Ultimately, musicians count using numbers, “ands” and vowel sounds. Downbeats within a measure are called 1, 2, 3… Upbeats are represented with a plus sign and are called “and” (i.e. 1 + 2 +), and further subdivisions receive the sounds “ee” and “uh” (i.e. 1 e + a 2 e + a). Musicians do not agree on what to call triplets: some simply say the word triplet (“trip-a-let”), or another three-syllable word (like pineapple or elephant) with an antepenultimate accent. Some use numbers along with the word triplet (i.e. “1-trip-let”). Still others have devised sounds like “ah-lee” or “la-li” added after the number (i.e. 1-la-li, 2-la-li or 1-tee-duh, 2-tee-duh).