Al-Khalil was primarily a
grammarian and using the
grammatical terminology of his day he made use of the terms "mobile letter" (i.e. one followed by a vowel) and "quiescent letter" (i.e. one not followed by a vowel) to build up larger prosodic units, which he called "peg" ( or , pl. ) and "cord" or "guy-rope" (, pl. ). In European descriptions, these are conventionally abbreviated "P" and "K" respectively. A "peg" is a sequence of two syllables, usually short + long (u –) (a ); but occasionally in the rarely used metres of circle 4, long + short (– u) (a ). A "cord" is a short syllable (u), long syllable (–), or two shorts (u u). Surprisingly, al-Khalil's system makes no use of the concept of the syllable as such. The is repeated at fixed points along the line and is generally unchanging, while the or cords are the syllables in between which could be modified. A peg and either one or two cords makes a (pl. ) "tent pole or support" or what in European terms is called a foot. Thus a half-line of the metre (, | u – x | u – x – | u – x | u – u – |) is analysed as PK PKK PK PKK. A complete line of poetry usually consists of either six or eight feet, but sometimes shorter lines are found. When analysing a verse, an Arab prosodist begins by rewriting the line phonetically, that is, as it is actually pronounced. Doubled letters are written twice and silent letters, such as the of the article when it follows a vowel, are omitted. Thus the word , in writing is written phonetically as "". In a word like (, pronounced , meaning "the sun"), where the "l" of the article is assimilated to the first consonant of the noun, the actual sound is written instead; so in writing, this is written (
ššms). Then each mobile letter is represented by a vertical line (ا), known as , and each quiescent letter by a small circle (ه), known as . Thus a will be represented in the scansion by two symbols and one . A line of poetry, known as a ( "tent"), is composed of two half-lines or
hemistichs, each of which is known as a ( "door-flap"). The first half-line is called the (, literally "forepart"), and the other is called the (, literally "rear"). The and the have two parts each: • The last word of the is called the ("central pole of a tent") and the rest of it is called (, meaning "the filling of the forepart") • The last word of the is called the (literally "the hitting (of the tent-peg)") and the rest of it is called (, meaning "the filling of the rear"). The last consonant of the and the vowel that comes after it are called the () and its last two s, all the letters that are in between, and the last before them, is called the () or 'rhyme'. == Al-Khalil's circles ==