Notations of median 

The median symbol represents an operator returning the median of its arguments. The median is a number separating the lower half of the sample values from the upper half.

Descriptions of this symbol

• OpenMath's sdata1/median 
• See median in Mathworld
• See median in MathML3
• See median in Wikipedia

Observations of this symbol

Put your observations here...

English 

 Here in the example on the right we find that the English book Statistics: Principles and Methods shows the median of the population 100p-th percentile in page number 228.
Go directly to the example in google books link

Encoding the observations of median

See encodings