APL logo: Difference between revisions

=== Cube Apple ===

This is a cube, which is a common APL motif, e.g. used for [[APL2]] (including the book [[Books#APL2_at_a_Glance|APL2 at a glance]]), [[APL*PLUS]] and [[Dyalog APL]]. However, one quarter has been modified to resemble a leaf, thus making the cube into an [[apple]], another common association with APL. The leaf is supposed to hint at the [[Del]] which symbolises [[function]] definition and has been used in application icons for [[APL+]] and [[APLX]]. The green colours come from [[IBM]]'s modern '''Carbon''' design to honour IBM's role APL's history. The lettering spells out "APL" while also hinting at APL's usage of special [[glyphs]]; here <code>⍝⍴⌊</code> which look very close to the forms found in the widespread ''APL385 Unicode'' [[font]].

[[File:Nested bitmaps logo dark.png|120px|frameless|left]]

[[File:Alternative nested bitmaps.png|frameless|right|Alternative nested bitmap logos]][[File:Nested bitmaps logo.png|120px|frameless|left]]

This logo is a reinterpretation based on the classic APL [[apple]] with the leaf styled as a filled [[Del]] which symbolises [[function]] definition and has been used in application icons for [[APL+]] and [[APLX]]. The green colour comes from [[IBM]]'s modern '''Carbon''' design to honour IBM's role APL's history. The apple is subdivided into a rectangular pattern which is supposed to invoke a [[matrix]] and  the middle row in turn holds three 4-row, 3-column [[Boolean]] matrices to spell out "APL" as bitmaps. This matrix of matrices hints at APL's multi-dimensional [[nested array]]s. The logo exists in various variations, and each comes has a version for light backgrounds and one for dark backgrounds.

[[File:Script logo.png|120px|frameless|left]]

[[File:Script logo filled.png|120px|frameless|right]]

=== Script logo ===

This [[apple]] logo is a basic update of [[IBM]]'s classic "I like APL" promotional, but with the leaf styled as a filled [[Del]] which symbolises [[function]] definition and has been used in application icons for [[APL+]] and [[APLX]].  The colours comes from [[IBM]]'s modern '''Carbon''' design to honour IBM's role APL's history. The script lettering commemorates APL's origins as handwritten notation and at the same time symbolises the ease with which APL is written. On dark backgrounds, the lettering would be produced in white rather than black. The logo also exists as a filled green version.

[[File:20210715 120122.jpg|120px|frameless|left]]

=== Parallel Lines ===

This logo is from the cover of the original edition of Paul Berry's [[SHARP APL]] Reference Manual.

[[File:Ligature Original.jpg|120px|frameless|left]]

=== Ligatures ===

This is Jon McGrew's reworks of an original design by Joseph DeKerf that used the [[wikipedia:ITC Avant Garde|ITC Avant Garde]] font. The original is arguably ambiguously APL/ALP, hence the alternative versions.