A hexastich is a stanza or short poem made up of six lines. The term describes the poem's line count rather than its subject or rhyme scheme, so a hexastich can follow many different patterns.
Example
Dawn lifts a silver edge across the hill,
The crows stir one by one in leafless trees;
A kettle whistles faintly from the sill,
And cold light moves like breath across the eaves.
The road unrolls beyond the waking gate,
While morning, line by line, begins to wait.