Jot Underbar ⍛

Jot Underbar is a dyadic operator

Operator Jot Underbar means Behind

      ⍝ Is it a palindrome?
      ⌽⍛≡ 'Dyalog' 
0
      ⌽⍛≡ 'racecar'
1

      ⍝ Drop from the right
      4-⍛↓'Dyalog APL'
Dyalog