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In Xcode this is called "Code Sense". And these icons also exist in Xcode 3. These icons are also used in symbol navigation. Red: macros <ul> <li><img src="https://i.stack.imgur.com/QaGsT.png" alt="#"> = macro (think <code>#define</code>)</li> </ul> Brown: Core Data / namespace <ul> <li><img src="https://i.stack.imgur.com/a1KfZ.png" alt="C"> = modeled class</li> <li><img src="https://i.stack.imgur.com/m216k.png" alt="M"> = modeled method</li> <li><img src="https://i.stack.imgur.com/YCx1g.png" alt="P"> = modeled property</li> <li><img src="https://i.stack.imgur.com/fXDdT.png" alt="N"> = C++ namespace</li> </ul> Orange: aliased types <ul> <li><img src="https://i.stack.imgur.com/ysYSp.png" alt="C with underscore"> = Objective-C category</li> <li><img src="https://i.stack.imgur.com/9ZQ6S.png" alt="E"> = enum</li> <li><img src="https://i.stack.imgur.com/C6KpQ.png" alt="T"> = typedef / typealias</li> <li><img src="https://i.stack.imgur.com/GWAyQ.png" alt="Ex"> = Swift extension</li> </ul> Green: variables <ul> <li><img src="https://i.stack.imgur.com/xmRr2.png" alt="B"> = binding</li> <li><img src="https://i.stack.imgur.com/vLjhf.png" alt="f"> = function</li> <li><img src="https://i.stack.imgur.com/4B1DM.png" alt="F"> = field</li> <li><img src="https://i.stack.imgur.com/Wz62i.png" alt="K"> = constant</li> <li><img src="https://i.stack.imgur.com/sCnZy.png" alt="L"> = local variable</li> <li><img src="https://i.stack.imgur.com/QFrpA.png" alt="O"> = IBOutlet</li> <li><img src="https://i.stack.imgur.com/SMQPu.png" alt="V"> = variable (can be ivar, global var, local var, etc.)</li> <li><img src="https://i.stack.imgur.com/MFDy9.png" alt="x"> = parameter (think f(x))</li> </ul> Blue: methods <ul> <li><img src="https://i.stack.imgur.com/WRY99.png" alt="A"> = IBAction</li> <li><img src="https://i.stack.imgur.com/oqYjC.png" alt="M"> = method</li> <li><img src="https://i.stack.imgur.com/VC5Gn.png" alt="P"> = property</li> </ul> Purple: aggregate types <ul> <li><img src="https://i.stack.imgur.com/tulgF.png" alt="C"> = class (Objective-C, Swift or C++)</li> <li><img src="https://i.stack.imgur.com/392Bx.png" alt="CE"> = class extension</li> <li><img src="https://i.stack.imgur.com/mDLIl.png" alt="Pr"> = Objective-C/Swift protocol</li> <li><img src="https://i.stack.imgur.com/zFkHy.png" alt="S"> = struct</li> <li><img src="https://i.stack.imgur.com/CrEZi.png" alt="U"> = union</li> </ul> Gray: snippets <ul> <li><img src="https://i.stack.imgur.com/RAYvb.png" alt="{}"> = snippets</li> </ul> Icons: <code>#pragma mark</code> or comments <ul> <li><img src="https://i.stack.imgur.com/T54le.png" alt="Flag"> = <code>!!!: ...</code></li> <li><img src="https://i.stack.imgur.com/wygLD.png" alt="Patch"> = <code>FIXME: ...</code></li> <li><img src="https://i.stack.imgur.com/vdfGI.png" alt="?"> = <code>???: ...</code></li> <li><img src="https://i.stack.imgur.com/03Xt8.png" alt="Items"> = <code>TODO: ...</code></li> <li><img src="https://i.stack.imgur.com/TXxrb.png" alt="List"> = <code>MARK: ...</code></li> </ul> You should be able to look up the meanings from the filenames from <code>/Developer/Library/PrivateFrameworks/DVTFoundation.framework/Resources/Xcode.SourceCodeSymbolKind.*.Icon.tiff</code>*. In later versions of Xcode, the path is moved to <code>/Applications/Xcode.app/Contents/SharedFrameworks/DVTFoundation.framework/Resources/Assets.car</code>, see <a href="https://stackoverflow.com/questions/22630418/analysing-assets-car-file-in-ios">Analysing Assets.car file in IOS</a> on how to extract the images from the *.car
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1. POXcode intellisense meaning of letters in colored boxes like f,T,C,M,P,C,K,# etc
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1. COThanks @KennyTM for your detailed answer! This will help me (and many others :)) to quickly ramp up on cocoa development on XCode. Thanks again!
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