Redefine Symbol

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Redefine Symbol is an esolang by User:ChuckEsoteric08 inspired by Emmental.

Commands

\ is an escape symbol for push command.

Command	Function
[abc]	Push string abc to the stack.
%	Swap top elements
"	Duplicate top element
$	Pop top element and discard it
.	Replace top element with last element popped.
=	Pop two elements, a and b. Then redifine symbol a as Redefine Symbol program b. If interpreter will reach symbol a then it would replace that symbol with program b.
+	Pop two elements, a and b. Then push ab.
;	Output top element.
?	Push user input.

Computational class

This program is Underload interpreter, proving that Redefine Sumbol is Turing-complete

[%][~]=[:]["]=[*][%+]=[(][\[]=[)][\]]=[a][\[\\\[\]+\[\\\]\]%+]=[S][;$]=[^][$.]=?$.