Infix usage of Composition[]. Have you ever wondered what the difference between @ and @* is, when even the
documentation shows that they have the same effect, see 'Different ways of entering compositions' in 'Properties & Relations', also 'Basic Examples'? Imho the documentation should show the opposite, the difference! It is true that in most instances the one can be replaced by the other so i always wonder (and the doc page wouldn't clarify).
However i found a useful example where you must use the Composition infix:
In[1]:= nx = {3, 2, 5, 3, 1};
ny = {1, 3, 2, 2};
Outer[Total@List, nx, ny] // Quiet(*doesn't return desired result*)
Out[3]= {{Total[List][3, 1], Total[List][3, 3], Total[List][3, 2], Total[List][3, 2]},
{Total[List][2, 1], Total[List][2, 3], Total[List][2, 2], Total[List][2, 2]},
{Total[List][5, 1], Total[List][5, 3], Total[List][5, 2], Total[List][5, 2]},
{Total[List][3, 1], Total[List][3, 3], Total[List][3, 2], Total[List][3, 2]},
{Total[List][1, 1], Total[List][1, 3], Total[List][1, 2], Total[List][1, 2]}}
In[4]:= Outer[Total@*List, nx, ny](*returns desired result*)
Out[4]= {{4, 6, 5, 5}, {3, 5, 4, 4}, {6, 8, 7, 7}, {4, 6, 5, 5}, {2, 4, 3, 3}}
Hope you found this tidbit yummy, thanks for looking!