lm

abbreviation

lumen(s).

1. long metre.
2. lunar module.

1. a metrical pattern for hymns in which the stanzas have four lines with eight syllables each.
2. a quatrain of iambic tetrameters with alternate lines rhyming.

noun, symbol

the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.

late 19th century: from Latin, literally ‘light’.