Final answer:
Accentual meter is the type of poetic meter with a fixed number of stresses per line, unlike iambic pentameter or trochaic tetrameter which count both stressed and unstressed syllables.
Step-by-step explanation:
The type of poetic meter that has a fixed number of stresses per line regardless of the number of syllables present is known as accentual meter. This form of poetry is differentiated from other types like iambic pentameter, which contains five sets of iambs per line, and trochaic tetrameter, which has four feet with a falling rhythm. Accentual meter focuses only on the number of stressed syllables, not on the total syllable count.