The result R is an integer scalar containing an integer value which indicates the type of the array. For further information see Data Representation (Monadic).
181⌶ is functionally identical to monadic ⎕DR, except that no attempt is made to squeeze the data into smaller data types. ⎕DR always attempts to squeeze the data; 181⌶ does not, but if a workspace compaction occurs during execution of 181⌶, the data may still be squeezed before the type is identified.
Example
⎕dr 1↑1 1000
11
(181⌶) 1↑1 1000
163