Vowel whose quality does not change over the duration of the vowel is called a monophthong. Monophthongs are sometimes called "pure" or "stable" vowels. A vowel sound that glides from one quality to another is called a diphthong, and a vowel sound that glides successively through three qualities is a triphthong. All languages have monophthongs and many languages have diphthongs, but triphthongs or vowel sounds with even more target qualities are relatively rare cross-linguistically. English has all three types: the vowel sound in "hit" is a monophthong , the vowel sound in "boy" is in most dialects a diphthong , and
Types of swords Types of swords This is a list of types of swords. The term sword used here is a narrow definition. This is not a general list of bladed weapons and does not include the machete or similar "sword-like" weapons. Swords and knives found in Southeast Asia are influenced by Indian, Chinese as well as Middle Eastern and European forms. All of the Islamic world during the 16th to 18th century, including the Ottoman Empire and Persia were influenced by the "scimitar" type of single-edged curved sword. Via the Mameluke sword this also gave rise to the European cavalry sabre. Terms