What's 10 Syllables per Line Called?

It means iambic pentameter

is a beat or foot that uses 10 syllables in each line. Simply, it is a rhythmic pattern comprising five iambs in each line, like five heartbeats. Iambic pentameter is one of the most commonly used meters in English poetry.

What is a 10 syllable line called?

accentual-syllabic verse

…the most common English metre, iambic pentameter, is a line of ten syllables or five iambic feet. Each iambic foot is composed of an unstressed syllable followed by a stressed syllable.

What type of poetry has 10 syllables?

A sonnet is simple enough: 14 lines written in iambic pentameter. That means each line has 10 syllables in an alternating unstressed-stressed (iambic) pattern.