Poetic rhythm is the overall beat or pulse of a poem, usually expressed in terms of beats per line. Poetic meter is the specific pattern of stressed and unstressed syllables within a line of poetry. Patterns of meter are usually expressed in terms of feet, with each foot having a specific number of syllables. For example, iambic pentameter is a common meter in English poetry, and it consists of five iambic feet per line (an iamb is a foot with a syllable stressed, followed by an unstressed syllable).