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A non-strict polymorphic, functional language by Jon Fairbairn <jf@cl.cam.ac.uk>.

Ponder's type system is unusual. It is more powerful than the Hindley-Milner type system used by ML and Miranda and extended by Haskell. Ponder adds extra recursive 'mu' types to those of Girard's System F, allowing more general recursion. Surprisingly, the type system and type inference algorithm are still not completely understood.

["Ponder and its Type System", J. Fairbairn, TR 31, Cambridge U Computer Lab, Nov 1982].

[J. Fairbairn, "Design and Implementation of a Simple Typed Language based on the Lambda-Calculus", Technical Report No. 75, Computer Laboratory, University of Cambridge, May 1985].

[J. Fairbairn, "A New Type-Checker for a Functional Language", Technical Report No. 53, Computer Laboratory, University of Cambridge, 1984].

[J. Fairbairn, "Some Types with Inclusion Properties in \forall, \rightarrow, \mu", Technical Report No. 171, Computer Laboratory, University of Cambridge, Jun 1989].

[Valeria C. V. de Paiva, "Subtyping in Ponder (Preliminary Report)", Technical Report No. 203, Computer Laboratory, University of Cambridge, Aug 1990].
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I pondering so important their mouths every years - will probably no longer be used for that purpose.
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But on further pondering I began to wonder who was embarrassed: Morrison, for this reversal of views?
Written by the guitar player/singer, its small initial chapters are two-to three-page autobiographical stories that set up the background of the hand, while the later sections are tour ruminations and philosophical and ideological monologues pondering What it is to be punk (if that's what it is), what role music plays in the big picture, and how sometimes the shittiest of times are the best of times.
Myers and Powell offer their audience the opportunity to read the diaries first, pondering them, and then coming to their own conclusions.
Americans in the 1890s were confronting the end of their frontier, and were pondering its meaning.
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In myself, I seem not too inclined to spend much time pondering the mystery of an unseen God.