Iamb
From Conservapedia
An iamb is a no stress-stress couplet (joinder of two syllables) in poetic meter. The iamb is famously used in iambic pentameter.[1]
An example of an iamb used in verse is this, from Shakespeare's Cymbeline. Capitalized syllables are stressed; uncapitalized syllables are unstressed.
“ | ALL OH-ver JOYED... save THOSE in BONDS. | ” |
Only the last two syllables are iambic: the first couple syllables are not in iambic pentameter, deliberately to set the joyous implications apart for comic effect.