[Axiom-developer] what is meaining of % in SPAD

[Page, Bill]

Dear Axiom Mavins:

If I read for example in expr.spad.pamphlet:

)abbrev domain EXPR Expression
++ Top-level mathematical expressions
++ Author: Manuel Bronstein
++ Date Created: 19 July 1988
++ Date Last Updated: October 1993 (P.Gianni), February 1995 (MB)
++ Description: Expressions involving symbolic functions.
++ Keywords: operator, kernel, function.
Expression(R:OrderedSet): Exports == Implementation where
  Q   ==> Fraction Integer
  K   ==> Kernel %
  MP  ==> SparseMultivariatePolynomial(R, K)
...
Implementation
...
    if R has IntegralDomain then
...
      Rep := Fraction MP

------------

What does the % represent?

Or more specifically, what exactly is the value of Rep above
if I write:

(%e<%pi)$EXPR INT

???

Where can I read about this notation in the Axiom documentation?

Regards,
Bill Page.