<meter> – To represent a scalar measurement within a known range, or a fractional value.
<progress> – To notify users of the progress of a download or task. It has two attributes: value (to specify the state of the progress) and max (to indicate the maximum value to reach). 
<pre> – To show preformatted text as it appears in the source. What this means is that multiple whitespace characters won’t be collapsed into one (changing the default manner that browsers handle whitespace).
<small> – To represent text often found in small print like disclaimers, caveats, legal restrictions, or copyrights.
<output> – To represent the result of a calculation. Its main attribute is for, which contains a list of space-separated IDs of the elements that went into the calculation, or that otherwise influenced the calculation.
Credits:Sajal Sharma